diff --git a/package-lock.json b/package-lock.json
index 413403d..5b4c746 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,9 +9,12 @@
       "version": "0.0.0",
       "devDependencies": {
         "@sveltejs/vite-plugin-svelte": "^3.0.2",
+        "@sveu/browser": "^1.0.1",
         "@tsconfig/svelte": "^5.0.2",
+        "sass": "^1.77.2",
         "svelte": "^4.2.12",
         "svelte-check": "^3.6.7",
+        "svelte-preprocess": "^5.1.4",
         "tslib": "^2.6.2",
         "typescript": "^5.2.2",
         "vite": "^5.2.0"
@@ -728,6 +731,21 @@
         "vite": "^5.0.0"
       }
     },
+    "node_modules/@sveu/browser": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@sveu/browser/-/browser-1.0.1.tgz",
+      "integrity": "sha512-Mz6Vx7erVabjL+yIM/9h9lqRjEbCiIRKjH9KD1VuR3xTTJdMiljoeWph9B+shg0n2VLhY2tz8PvTu6H3eqhF8g==",
+      "dev": true,
+      "dependencies": {
+        "@sveu/shared": "^1.0.1"
+      }
+    },
+    "node_modules/@sveu/shared": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@sveu/shared/-/shared-1.0.1.tgz",
+      "integrity": "sha512-waMJ+UXD5NV/M7L6lmXigY9Ry9TwhcBz+QDbYsDcq92bL7nlRUeh3ckvvAnxw1Nzw0T2JeEgmvZZblHuAHJL9Q==",
+      "dev": true
+    },
     "node_modules/@tsconfig/svelte": {
       "version": "5.0.4",
       "resolved": "https://registry.npmjs.org/@tsconfig/svelte/-/svelte-5.0.4.tgz",
@@ -1095,6 +1113,12 @@
       "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
       "dev": true
     },
+    "node_modules/immutable": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.6.tgz",
+      "integrity": "sha512-Ju0+lEMyzMVZarkTn/gqRpdqd5dOPaz1mCZ0SH3JV6iFw81PldE/PEB1hWVEA288HPt4WXW8O7AWxB10M+03QQ==",
+      "dev": true
+    },
     "node_modules/import-fresh": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
@@ -1546,6 +1570,23 @@
         "rimraf": "^2.5.2"
       }
     },
+    "node_modules/sass": {
+      "version": "1.77.2",
+      "resolved": "https://registry.npmjs.org/sass/-/sass-1.77.2.tgz",
+      "integrity": "sha512-eb4GZt1C3avsX3heBNlrc7I09nyT00IUuo4eFhAbeXWU2fvA7oXI53SxODVAA+zgZCk9aunAZgO+losjR3fAwA==",
+      "dev": true,
+      "dependencies": {
+        "chokidar": ">=3.0.0 <4.0.0",
+        "immutable": "^4.0.0",
+        "source-map-js": ">=0.6.2 <2.0.0"
+      },
+      "bin": {
+        "sass": "sass.js"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/sorcery": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/sorcery/-/sorcery-0.11.0.tgz",
diff --git a/package.json b/package.json
index 384be46..6ada2a3 100644
--- a/package.json
+++ b/package.json
@@ -11,9 +11,12 @@
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^3.0.2",
+    "@sveu/browser": "^1.0.1",
     "@tsconfig/svelte": "^5.0.2",
+    "sass": "^1.77.2",
     "svelte": "^4.2.12",
     "svelte-check": "^3.6.7",
+    "svelte-preprocess": "^5.1.4",
     "tslib": "^2.6.2",
     "typescript": "^5.2.2",
     "vite": "^5.2.0"
diff --git a/src/Viz.svelte b/src/Viz.svelte
index 8c5e275..f8ddc0e 100644
--- a/src/Viz.svelte
+++ b/src/Viz.svelte
@@ -1,11 +1,23 @@
 <script lang="ts">
     import parsed_requests from "/data/parsed_requests.json";
+    import { draw, slide } from "svelte/transition";
+    import { fps } from "@sveu/browser";
 
-    import { draw } from "svelte/transition";
+    import { All, Scene, Timeline } from "./scenes/Scenes";
+    import {
+        type Location,
+        type Movement,
+        type Item,
+        type Motion,
+        get_path_d,
+    } from "./lib/types";
 
     // these are passed from main.ts (or vice versaas)
     export let width = 0;
     export let height = 0;
+    export let dev: Boolean = false;
+
+    const _fps = fps();
 
     const node_positions_percentages = {
         APM: [13.829853909464873, 11.277305564859935],
@@ -26,65 +38,69 @@
     };
 
     const node_positions = Object.fromEntries(
-            Object.entries(node_positions_percentages).map(([k, p]) => [
-                k,
-                [(p[0] / 100) * width, (p[1] / 100) * height],
-            ]),
-        );
-
+        Object.entries(node_positions_percentages).map(([k, p]) => [
+            k,
+            [(p[0] / 100) * width, (p[1] / 100) * height],
+        ]),
+    );
 
     $: console.log(parsed_requests);
 
     // preprocess data
-    const nodes = parsed_requests.nodes;
-    const edges: Array<Object> = parsed_requests.edges;
+    const _nodes: Location[] = parsed_requests.nodes;
+    const _requests: Array<Object> = parsed_requests.edges;
+
+    const items = new Map<string, Item>();
+    const movements: Array<Movement> = [];
 
     // filter nodes with only having both Latitude and Longitude.
     // then map these coordinates to the canvas space
-    const valid_nodes = nodes
+    const locations = _nodes
         .filter((n) => n.lat && n.lon)
         .map((node) => {
             node["x"] = node_positions[node.code][0];
             node["y"] = node_positions[node.code][1];
-            // const { x: x1, y: y1 } = latLonToOffsets(
-            //     node.lat,
-            //     node.lon,
-            //     100000,
-            //     100000,
-            // );
-            // console.log(x1, y1);
-            // const x2 = inverse_lerp(1358, 1380, x1);
-            // const y2 = inverse_lerp(32862, 32900, y1);
-
-            // const margin = 200;
-            // const x = x2 * (width - 2 * margin) + margin;
-            // const y = y2 * (height - 2 * margin) + margin;
-            // // console.log(x2, y2)
-            // // console.log(node)
-
-            // node["x"] = x;
-            // node["y"] = y;
             return node;
         });
 
     // create an index to access the node objects by their name
+    const nodeMap: Map<String, Location> = new Map(
+        locations.map((d) => [d["name"], d]),
+    );
 
-    const nodeMap = Object.fromEntries(valid_nodes.map((d) => [d["name"], d]));
-    const edgeIndexBarcode = buildIndex(edges, "Barcode");
-    // console.log(edgeIndexBarcode);
-
-    const movements = edges
+    _requests
+        .filter((n) => n['Owning Library Name'] !=  n['Pickup Location'])
         .filter(
             (l) =>
-                nodeMap[l["Owning Library Name"]] &&
-                nodeMap[l["Pickup Location"]],
+                nodeMap.has(l["Owning Library Name"]) &&
+                nodeMap.has(l["Pickup Location"]),
         )
-        .map((l, idx) => {
-            l.source = nodeMap[l["Owning Library Name"]];
-            l.target = nodeMap[l["Pickup Location"]];
-            l.nr = idx;
-            return l;
+        .forEach((r, idx) => {
+            const identifier: String = r["Barcode"];
+            if (!items.has(identifier)) {
+                items.set(identifier, {
+                    title: r["Title (Complete)"],
+                    MMS: r["MMS Id"],
+                    Barcode: r["Barcode"],
+                    Publisher: r["Publisher"],
+                    _original: r,
+                });
+            }
+            let movement: Movement = {
+                source: nodeMap.get(r["Owning Library Name"]),
+                target: nodeMap.get(r["Pickup Location"]),
+                nr: idx,
+                item: items.get(identifier),
+                _original: r,
+                d: "", // bit of a hacky workaround, refactor in object
+            };
+            movement.d = get_path_d(movement);
+            movements.push(movement);
         });
+    console.log(items, movements);
+
+    // const edgeIndexBarcode = buildIndex(edges, "Barcode");
+    // console.log(edgeIndexBarcode);
 
     function degreesToRadians(degrees: number) {
         return (degrees * Math.PI) / 180;
@@ -118,118 +134,107 @@
         [index: string]: Array<number>;
     }
 
-    function buildIndex(objectList: Array<Object>, field: string): IndexObject {
-        const index = {};
-        for (const idx in objectList) {
-            const v = objectList[idx][field];
-            if (!index.hasOwnProperty(v)) {
-                index[v] = [idx];
-            } else {
-                index[v].push(idx);
-            }
-        }
-        return index;
-    }
+    // function buildIndex(objectList: Array<Object>, field: string): IndexObject {
+    //     const index = {};
+    //     for (const idx in objectList) {
+    //         const v = objectList[idx][field];
+    //         if (!index.hasOwnProperty(v)) {
+    //             index[v] = [idx];
+    //         } else {
+    //             index[v].push(idx);
+    //         }
+    //     }
+    //     return index;
+    // }
 
-    function get_path_d(movement) {
-        const m = movement;
-        let sourceX, targetX, midX, dx, dy, angle;
+    const occurences = new Map<Item, Movement[]>();
+    movements.forEach((movement, idx) => {
+        let movements = occurences.get(movement.item) ?? []
+        movements.push(movement)
+        occurences.set(movement.item, movements);
+    });
 
-        // This mess makes the arrows exactly perfect.
-        // thanks to http://bl.ocks.org/curran/9b73eb564c1c8a3d8f3ab207de364bf4
-        if (m.source.x < m.target.x) {
-            sourceX = m.source.x;
-            targetX = m.target.x;
-        } else if (m.target.x < m.source.x) {
-            targetX = m.target.x;
-            sourceX = m.source.x;
-        } else if (m.target.isCircle) {
-            targetX = sourceX = m.target.x;
-        } else if (m.source.isCircle) {
-            targetX = sourceX = m.source.x;
-        } else {
-            midX = (m.source.x + m.target.x) / 2;
-            if (midX > m.target.x) {
-                midX = m.target.x;
-            } else if (midX > m.source.x) {
-                midX = m.source.x;
-            } else if (midX < m.target.x) {
-                midX = m.target.x;
-            } else if (midX < m.source.x) {
-                midX = m.source.x;
-            }
-            targetX = sourceX = midX;
-        }
-
-        dx = targetX - sourceX;
-        dy = m.target.y - m.source.y;
-        angle = Math.atan2(dx, dy);
-
-        var srcSize = 5; //_mapGraph.getSizeForNode(m.source);
-        var tgtSize = 5; //_mapGraph.getSizeForNode(m.target);
-
-        // Compute the line endpoint such that the arrow
-        // it not in the center, but rather slightly out of it
-        // use a small ofset for the angle to compensate roughly for the curve
-        m.sourceX = sourceX + Math.sin(angle + 0.5) * srcSize;
-        m.targetX = targetX - Math.sin(angle - 0.5) * tgtSize;
-        m.sourceY = m.source.y + Math.cos(angle + 0.5) * srcSize;
-        m.targetY = m.target.y - Math.cos(angle - 0.5) * tgtSize;
-
-        // find radius of arc based on distance between points
-        // add a jitter to spread out the lines when links are stacked
-        const dr = Math.sqrt(dx * dx + dy * dy) * (0.7 + Math.random() * 0.5);
-
-        // "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y
-        return `M ${m.sourceX},${m.sourceY} A ${dr},${dr} 0 0,1   ${m.targetX},${m.targetY}`;
-    }
-
-    console.log(movements);
-
-    let drawn_movements = movements; //.filter((m, i) => i < 100);
+    let drawn_motions = writable(<Motion[]>[]); //.filter((m, i) => i < 100);
+    $: opacity = Math.max(0.055, Math.min(1, 200 / $drawn_motions.length));
+    let overlay_motions = writable(<Motion[]>[]); //.filter((m, i) => i < 100);
+    let events = writable(<Event[]>[]); //.filter((m, i) => i < 100);
 
     import { onMount, onDestroy } from "svelte";
+    import { writable } from "svelte/store";
+
+    let scenes = [All, Timeline];
+    let currentSceneI = 0;
+    let currentScene: Scene;
+
+    function nextScene() {
+        if (currentScene) {
+            currentScene.stop();
+        }
+
+        console.log("Next scene", currentSceneI);
+        currentScene = new scenes[currentSceneI](
+            movements,
+            drawn_motions,
+            nextScene,
+            occurences,
+        );
+        currentSceneI = (currentSceneI + 1) % scenes.length;
+    }
+
     let paused = false;
     onMount(() => {
         let interval = null;
-        
-        interval = setInterval(() => {
-            if (paused) {
-                return;
-            }
-            // TODO: change scene
-            // timeElapsed += 1;
+        nextScene();
+        // interval = setInterval(() => {
+        //     if (paused) {
+        //         return;
+        //     }
+        //     // TODO: change scene
+        //     // timeElapsed += 1;
+        //     const n = Math.ceil(Math.random() * 8);
+        //     const start_i = Math.floor((movements.length - n) * Math.random());
+        //     drawn_movements = movements.filter(
+        //         (m, i) => i >= start_i && i < start_i + n,
+        //     );
 
-            // if (remainingTime === 0) {
-            // 	clearInterval(interval);
-            // 	deleteTimer();
-            // }
-        }, 10000);
+        //     // if (remainingTime === 0) {
+        //     // 	clearInterval(interval);
+        //     // 	deleteTimer();
+        //     // }
+        // }, 2000);
 
         return () => {
-            clearInterval(interval);
-        }
+            currentScene.stop();
+            // clearInterval(interval);
+        };
     });
 </script>
 
 <h1>library of <span id="motiontitle">motions</span></h1>
 <div id="about">
-    Work by <em>Ruben van de Ven</em> for the
-    <em>University of Amsterdam Library</em>. Fonts by
-    <em>Open Source Publishing</em>, map by <em>OpenStreetMap</em>.
+    <span>Work by <em>Ruben van de Ven</em> for the
+    <em>University of Amsterdam Library</em>.</span>
+    <span>Fonts by <em>Open Source Publishing</em>.</span>
 </div>
 
 <svg {width} {height}>
     <g id="movements">
-        {#each drawn_movements as m}
+        {#each $drawn_motions as m}
             <path
-                in:draw|global={{ duration: 5000 + Math.random() * 10000 }}
-                d={get_path_d(m)}
+                in:draw|global={{ duration: m.duration }}
+                d={m.movement.d}
+                style="opacity: {opacity}"
+            ></path>
+        {/each}
+    </g>
+    <g id="overlay_motions">
+        {#each $overlay_motions as m}
+            <path in:draw|global={{ duration: m.duration }} d={m.movement.d}
             ></path>
         {/each}
     </g>
     <g id="libraries">
-        {#each valid_nodes as node}
+        {#each locations as node}
             <g id={node.code} transform="translate({node.x}, {node.y})">
                 <circle r="5"></circle>
                 <circle r="20"></circle>
@@ -239,7 +244,52 @@
     </g>
 </svg>
 
-<style>
+{#if currentScene?.rendered_elements.indexOf("timeline") >= 0}
+    <div id="timeline">
+        {#each $events as m}
+            <div class="entry" in:slide={{ duration: 200 }}>
+                <!-- {m['Title (Complete)']} -->
+                <span class="date"
+                    >{m.movement._original["Request Completion Date"]}</span
+                >
+                <span class="location">{m.movement.target.name}</span>
+            </div>
+        {/each}
+    </div>
+{/if}
+
+{#if dev}
+    <div id="fps">{$_fps}</div>
+    <div id="controls">
+        <button on:click={nextScene}>▷</button>
+    </div>
+{/if}
+
+<style lang="scss">
+    * {
+        color: white;
+    }
+    #timeline {
+        position: absolute;
+        bottom: 20px;
+        left: 20px;
+    }
+    #fps {
+        position: absolute;
+        top: 10px;
+        right: 10px;
+        z-index: 9999;
+        font-size: 30px;
+        /* color: white; */
+    }
+    #controls {
+        position: absolute;
+        top: 10px;
+        right: 40px;
+        z-index: 9999;
+        font-size: 30px;
+        /* color: white; */
+    }
     #about {
         position: absolute;
         font-size: 8pt;
@@ -247,6 +297,10 @@
         right: 20px;
         width: 450px;
         text-align: right;
+        
+        span{
+            display:block;
+        }
     }
     #libraries circle:first-child {
         fill: white;
@@ -258,10 +312,15 @@
         stroke-width: 10;
     }
     path {
-        stroke: #bc89ff15;
+        stroke: #bc89ff;
         stroke-width: 2px;
         fill: none;
     }
+    #overlay_motions path {
+        stroke: red;
+        stroke-width: 4;
+        opacity: 1;
+    }
     text {
         fill: white;
         font-size: 30pt;
diff --git a/src/lib/types.ts b/src/lib/types.ts
new file mode 100644
index 0000000..ef866bb
--- /dev/null
+++ b/src/lib/types.ts
@@ -0,0 +1,89 @@
+export type Location = Object;
+
+// disambiguated (physical or online) library object
+export type Item = {
+    title: String,
+    MMS: String,
+    Barcode: String, // String because of preceding 0
+    Publisher: String,
+    _original: Object
+}
+
+// A movement of the object (Request in Alma Analytics)
+export type Movement = {
+    nr: number, // unique identifier in the set
+    source: Location,
+    target: Location,
+    item: Item,
+    _original: Object
+    // also contains additional request data (see requests.csv)
+    d: String
+};
+
+
+
+// An event to trigger drawing an Edge
+export type Motion = {
+    duration: number,
+    movement: Movement,
+}
+
+export type Event = {
+    date: Date,
+    title: String,
+    description: String
+}
+
+export function get_path_d(movement: Movement) {
+    const m = movement;
+    // console.log(m)
+    let sourceX, targetX, midX, dx, dy, angle;
+
+    // This mess makes the arrows exactly perfect.
+    // thanks to http://bl.ocks.org/curran/9b73eb564c1c8a3d8f3ab207de364bf4
+    if (m.source.x < m.target.x) {
+        sourceX = m.source.x;
+        targetX = m.target.x;
+    } else if (m.target.x < m.source.x) {
+        targetX = m.target.x;
+        sourceX = m.source.x;
+    } else if (m.target.isCircle) {
+        targetX = sourceX = m.target.x;
+    } else if (m.source.isCircle) {
+        targetX = sourceX = m.source.x;
+    } else {
+        midX = (m.source.x + m.target.x) / 2;
+        if (midX > m.target.x) {
+            midX = m.target.x;
+        } else if (midX > m.source.x) {
+            midX = m.source.x;
+        } else if (midX < m.target.x) {
+            midX = m.target.x;
+        } else if (midX < m.source.x) {
+            midX = m.source.x;
+        }
+        targetX = sourceX = midX;
+    }
+
+    dx = targetX - sourceX;
+    dy = m.target.y - m.source.y;
+    angle = Math.atan2(dx, dy);
+
+    var srcSize = 5; //_mapGraph.getSizeForNode(m.source);
+    var tgtSize = 5; //_mapGraph.getSizeForNode(m.target);
+
+    // Compute the line endpoint such that the arrow
+    // it not in the center, but rather slightly out of it
+    // use a small ofset for the Movemente to compensate roughly for the curve
+    let m_sourceX = sourceX + Math.sin(angle + 0.5) * srcSize;
+    let m_targetX = targetX - Math.sin(angle - 0.5) * tgtSize;
+    let m_sourceY = m.source.y + Math.cos(angle + 0.5) * srcSize;
+    let m_targetY = m.target.y - Math.cos(angle - 0.5) * tgtSize;
+
+    // find radius of arc based on distance between points
+    // add a jitter to spread out the lines when links are stacked
+    const dr = Math.sqrt(dx * dx + dy * dy) * (0.7 + Math.random() * 0.5);
+
+    // "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y
+    return `M ${m_sourceX},${m_sourceY} A ${dr},${dr} 0 0,1   ${m_targetX},${m_targetY}`;
+}
diff --git a/src/main.ts b/src/main.ts
index d7ef3fc..946235f 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -11,7 +11,8 @@ const app = new Viz({
   target: document.getElementById('viz')!,
   props: {
     width: width,
-    height: height
+    height: height,
+    dev: true
   },
   // intro: true,
 })
diff --git a/src/scenes/Scenes.ts b/src/scenes/Scenes.ts
new file mode 100644
index 0000000..ef810b7
--- /dev/null
+++ b/src/scenes/Scenes.ts
@@ -0,0 +1,128 @@
+import type { Writable } from "svelte/store";
+import type { Item, Motion, Movement } from "../lib/types";
+
+export class Scene {
+    rendered_elements: String[] = []
+    stop() {
+        console.log("TODO: stop timeout")
+    }
+}
+
+export class All extends Scene {
+    allMovements: Movement[]
+    motions: Writable<Motion[]>
+    interval: number
+    step: number = 0
+    nextScene: CallableFunction
+    locationCounts = new Map<Location, { in: number, out: number }>()
+
+    constructor(movements: Movement[], motions: Writable<Motion[]>, nextScene: CallableFunction, occurences: Map<Item, Movements[]>) {
+        super()
+
+        this.nextScene = nextScene
+
+        // start setInterval to trigger additions per 100 or so to drawn_movements (rendered on map)
+        // when done, trigger parent.done()
+        this.allMovements = movements;
+
+        this.motions = motions
+        // TODO: group by hour and have it last nr-of-hours * interval
+        // TODO: then, add a timeline
+        // TODO: then, add an overlay with relevant events, e.g. 
+        // TODO: when a the oldest object was moved, the newest object,
+        // TODO: when a an object wasn't moved for very long, 
+        // TODO: .. and any other filter
+        // TODO: then finish with a summary per location
+        // TODO:    .. (or add these in small prints as counters under the location names)
+        this.interval = setInterval(this.tick.bind(this), 500);
+
+        // clear the motions when kicking off:
+        this.motions.update(items => []);
+    }
+
+    tick() {
+        const n = 10
+        if (this.step >= this.allMovements.length) {
+            console.log('this', 'done')
+            // todo: ease out all entries
+            this.nextScene()
+            return;
+        }
+        let movements: Movement[] = this.allMovements.slice(this.step, this.step + n);
+
+        // duration 5000 + Math.random() * 10000
+        let motions: Motion[] = movements.map((m) => ({ duration: 5000, movement: m }));
+
+        this.motions.update(items => ([...items, ...motions]))
+        this.step += n;
+    }
+
+    stop() {
+        clearInterval(this.interval)
+    }
+
+    scene_type = 'dedicated' //dedicated (like timeline) or overlay (like oldest)
+
+}
+
+export class Timeline extends Scene {
+    movements: Movement[]
+    item: Item
+    motions: Writable<Motion[]>
+    interval: number
+    step: number = 0
+    nextScene: CallableFunction
+    locationCounts = new Map<Location, { in: number, out: number }>()
+
+    constructor(allMovements: Movement[], motions: Writable<Motion[]>, nextScene: CallableFunction, occurences: Map<Item, Movements[]>) {
+        super()
+
+        this.nextScene = nextScene
+
+        // start setInterval to trigger additions per 100 or so to drawn_movements (rendered on map)
+        // when done, trigger parent.done()
+        console.log('s',occurences)
+        const [ item, movements ]= this.pickMovements(occurences);
+        this.item = item
+        this.movements = movements
+        console.log(item, movements)
+
+        this.motions = motions
+        this.motions.update(items => [])
+
+        this.interval = setInterval(this.tick.bind(this), 3000);
+
+
+    }
+
+    pickMovements(occurences: Map<Item, Movement[]>) {
+        
+        const item_movements = [...occurences]
+            // TODO: variable lenght, prefer with most steps
+            .filter(([item, movements]) =>  movements.length > 1)
+            
+        return item_movements[Math.floor(Math.random() * item_movements.length)]
+    }
+
+    tick() {
+        if (this.step >= this.movements.length) {
+            console.log('this', 'done')
+            // todo: ease out all entries
+            this.nextScene()
+            return;
+        }
+        
+        // duration 5000 + Math.random() * 10000
+        const motion: Motion = { duration: 2000, movement: this.movements[this.step] };
+        console.log(motion, motion.movement.source, motion.movement.target)
+        this.motions.update(items => ([...items, motion]))
+        this.step += 1;
+    }
+
+    stop() {
+        clearInterval(this.interval)
+    }
+
+    scene_type = 'dedicated' //dedicated (like timeline) or overlay (like oldest)
+
+}
\ No newline at end of file