diff --git a/src/lib/components/ComfyJourneyView.svelte b/src/lib/components/ComfyJourneyView.svelte
index 087feb2..7404245 100644
--- a/src/lib/components/ComfyJourneyView.svelte
+++ b/src/lib/components/ComfyJourneyView.svelte
@@ -4,49 +4,23 @@
      jump between past and present sets of parameters.
 -->
 <script lang="ts">
- import Graph from './graph/Graph.svelte'
- import GraphNode from './graph/GraphNode.svelte'
- import GraphEdge from './graph/GraphEdge.svelte'
-
  import type ComfyApp from './ComfyApp';
+ import type { ComfyBoxWorkflow } from '$lib/stores/workflowState';
+ import workflowState from '$lib/stores/workflowState';
+ import type { WritableJourneyStateStore } from '$lib/stores/journeyStates';
+ import JourneyRenderer from './JourneyRenderer.svelte';
 
  export let app: ComfyApp;
 
- const nodes = [
-     { id: 'N1', label: 'Start' },
-     { id: 'N2', label: '4' },
-     { id: 'N4', label: '8' },
-     { id: 'N5', label: '15' },
-     { id: 'N3', label: '16' },
-     { id: 'N6', label: '23' },
-     { id: 'N7', label: '42' },
-     { id: 'N8', label: 'End' }
- ]
+ let workflow: ComfyBoxWorkflow;
+ let journey: WritableJourneyStateStore
 
- const edges = [
-     { id: 'E1', source: 'N1', target: 'N2' },
-     { id: 'E2', source: 'N2', target: 'N3' },
-     { id: 'E3', source: 'N3', target: 'N6' },
-     { id: 'E4', source: 'N2', target: 'N4' },
-     { id: 'E5', source: 'N4', target: 'N5' },
-     { id: 'E6', source: 'N5', target: 'N4', label: '2' },
-     { id: 'E7', source: 'N5', target: 'N6' },
-     { id: 'E8', source: 'N6', target: 'N7' },
-     { id: 'E9', source: 'N7', target: 'N7', label: '3' },
-     { id: 'E10', source: 'N7', target: 'N8' }
- ]
+ $: workflow = $workflowState.activeWorkflow
+ $: journey = workflow?.journey
 </script>
 
 <div class="journey-view">
-    <Graph>
-        {#each nodes as node}
-            <GraphNode node={node}/>
-        {/each}
-
-        {#each edges as edge}
-            <GraphEdge edge={edge}/>
-        {/each}
-    </Graph>
+    <JourneyRenderer {workflow} {journey} />
 </div>
 
 <style lang="scss">
diff --git a/src/lib/components/JourneyRenderer.svelte b/src/lib/components/JourneyRenderer.svelte
new file mode 100644
index 0000000..fa0f9f0
--- /dev/null
+++ b/src/lib/components/JourneyRenderer.svelte
@@ -0,0 +1,38 @@
+<script lang="ts">
+ import type { WritableJourneyStateStore } from '$lib/stores/journeyStates';
+ import { ComfyBoxWorkflow } from '$lib/stores/workflowState';
+ import Graph from './graph/Graph.svelte'
+ import type { NodeDataDefinition, EdgeDataDefinition } from 'cytoscape';
+ import { NodeDataDefinition } from 'cytoscape';
+
+ export let workflow: ComfyBoxWorkflow | null = null
+ export let journey: WritableJourneyStateStore | null = ull
+
+ const nodes: NodeDataDefinition[] = [
+     { id: 'N1', label: 'Start' },
+     { id: 'N2', label: '4' },
+     { id: 'N4', label: '8' },
+     { id: 'N5', label: '15' },
+     { id: 'N3', label: '16' },
+     { id: 'N6', label: '23' },
+     { id: 'N7', label: '42' },
+     { id: 'N8', label: 'End' }
+ ]
+
+ const edges: EdgeDataDefinition[] = [
+     { id: 'E1', source: 'N1', target: 'N2' },
+     { id: 'E2', source: 'N2', target: 'N3' },
+     { id: 'E3', source: 'N3', target: 'N6' },
+     { id: 'E4', source: 'N2', target: 'N4' },
+     { id: 'E5', source: 'N4', target: 'N5' },
+     { id: 'E6', source: 'N5', target: 'N4', label: '2' },
+     { id: 'E7', source: 'N5', target: 'N6' },
+     { id: 'E8', source: 'N6', target: 'N7' },
+     { id: 'E9', source: 'N7', target: 'N7', label: '3' },
+     { id: 'E10', source: 'N7', target: 'N8' }
+ ]
+</script>
+
+{#if workflow && journey}
+    <Graph {nodes} {edges} style="background: var(--neutral-900)" />
+{/if}
diff --git a/src/lib/components/graph/Graph.svelte b/src/lib/components/graph/Graph.svelte
index df5d5bc..cde6236 100644
--- a/src/lib/components/graph/Graph.svelte
+++ b/src/lib/components/graph/Graph.svelte
@@ -7,49 +7,70 @@
 </script>
 
 <script lang="ts">
-  import { onMount, setContext } from "svelte"
-  import cytoscape from "cytoscape"
-  import dagre from "cytoscape-dagre"
-  import GraphStyles from "./GraphStyles"
+ import cytoscape from "cytoscape"
+ import dagre from "cytoscape-dagre"
+ import GraphStyles from "./GraphStyles"
+ import type { EdgeDataDefinition } from "cytoscape";
+ import type { NodeDataDefinition } from "cytoscape";
 
- const graphContext: GraphContext = {
-     getCyInstance: () => cyInstance
+ export let nodes: ReadonlyArray<NodeDataDefinition>;
+ export let edges: ReadonlyArray<EdgeDataDefinition>;
+
+ export let style: string = ""
+
+ $: if (nodes != null && edges != null && refElement != null) {
+     rebuildGraph()
+ }
+ else {
+     cyInstance = null;
  }
- setContext(GRAPH_STATE, graphContext)
 
-  let refElement = null
-  let cyInstance: cytoscape.Core = null
+ let _nodes: any[];
+ let _edges: any[];
 
-  onMount(() => {
-    cytoscape.use(dagre)
+ function rebuildGraph() {
+     cytoscape.use(dagre)
 
-    cyInstance = cytoscape({
-      container: refElement,
-      style: GraphStyles,
+     cyInstance = cytoscape({
+         container: refElement,
+         style: GraphStyles,
+         wheelSensitivity: 0.1,
+     })
 
-    })
+     cyInstance.on("add", () => {
+         cyInstance
+             .makeLayout({
+                 name: "dagre",
+                 rankDir: "TB",
+                 nodeSep: 150
+             })
+             .run()
+     })
 
-    cyInstance.on("add", () => {
-      cyInstance
-        .makeLayout({
-          name: "dagre",
-          rankDir: "TB",
-          nodeSep: 150
-        })
-        .run()
-    })
-  })
+     for (const node of nodes) {
+         cyInstance.add({
+             group: 'nodes',
+             data: { ...node }
+         })
+     }
 
+     for (const edge of edges) {
+         cyInstance.add({
+             group: 'edges',
+             data: { ...edge }
+         })
+     }
+ }
+
+ let refElement = null
+ let cyInstance: cytoscape.Core = null
 </script>
 
-<div class="graph" bind:this={refElement}>
-  {#if cyInstance}
-    <slot></slot>
-  {/if}
+<div class="cy-graph" {style} bind:this={refElement}>
 </div>
 
 <style lang="scss">
- .graph {
+ .cy-graph {
      background: white;
      width: 100%;
      height: 100%;
diff --git a/src/lib/components/graph/GraphEdge.svelte b/src/lib/components/graph/GraphEdge.svelte
index 2150c33..dbb374b 100644
--- a/src/lib/components/graph/GraphEdge.svelte
+++ b/src/lib/components/graph/GraphEdge.svelte
@@ -1,15 +1,15 @@
 <script lang="ts">
  import { onMount, getContext } from 'svelte'
  import { GRAPH_STATE, type GraphContext } from './Graph.svelte';
+ import type { EdgeDataDefinition } from 'cytoscape';
 
- export let edge
+ export let edge: EdgeDataDefinition
 
  const { getCyInstance } = getContext(GRAPH_STATE) as GraphContext;
  const cyInstance = getCyInstance()
 
  cyInstance.add({
      group: 'edges',
-     id: edge.id,
      data: { ...edge }
  })
 </script>
diff --git a/src/lib/components/graph/GraphNode.svelte b/src/lib/components/graph/GraphNode.svelte
index a9ce900..23c302b 100644
--- a/src/lib/components/graph/GraphNode.svelte
+++ b/src/lib/components/graph/GraphNode.svelte
@@ -1,15 +1,15 @@
 <script lang="ts">
-  import { onMount, getContext } from 'svelte'
-	import { GRAPH_STATE, type GraphContext } from './Graph.svelte';
+ import { onMount, getContext } from 'svelte'
+ import { GRAPH_STATE, type GraphContext } from './Graph.svelte';
+ import type { NodeDataDefinition } from 'cytoscape';
 
-  export let node
+ export let node: NodeDataDefinition
 
-  const { getCyInstance } = getContext(GRAPH_STATE) as GraphContext
-  const cyInstance = getCyInstance()
+ const { getCyInstance } = getContext(GRAPH_STATE) as GraphContext
+ const cyInstance = getCyInstance()
 
-  cyInstance.add({
-    group: 'nodes',
-    id: node.id,
-    data: { ...node }
-  })
+ cyInstance.add({
+     group: 'nodes',
+     data: { ...node }
+ })
 </script>
diff --git a/src/lib/components/graph/GraphStyles.ts b/src/lib/components/graph/GraphStyles.ts
index ed3528a..d4e4cc0 100644
--- a/src/lib/components/graph/GraphStyles.ts
+++ b/src/lib/components/graph/GraphStyles.ts
@@ -1,27 +1,30 @@
-export default [
+import type { Stylesheet } from "cytoscape";
+
+const styles: Stylesheet[] = [
     {
         selector: 'node',
         style: {
             'width': '50',
             'height': '50',
+            'font-family': 'Arial',
             'font-size': '18',
-            'font-weight': 'bold',
+            'font-weight': 'normal',
             'content': `data(label)`,
             'text-valign': 'center',
             'text-wrap': 'wrap',
             'text-max-width': '140',
-            'background-color': 'gold',
-            'border-color': 'orange',
+            'background-color': '#60a5fa',
+            'border-color': '#2563eb',
             'border-width': '3',
-            'color': 'darkred'
+            'color': '#1d3660'
         }
     },
     {
         selector: 'node:selected',
         style: {
-            'background-color': 'darkred',
+            'background-color': '#f97316',
             color: 'white',
-            'border-color': 'darkred',
+            'border-color': '#ea580c',
             'line-color': '#0e76ba',
             'target-arrow-color': '#0e76ba'
         }
@@ -36,8 +39,8 @@ export default [
             'text-background-padding': '3',
             'width': '3',
             'target-arrow-shape': 'triangle',
-            'line-color': 'darkred',
-            'target-arrow-color': 'darkred',
+            'line-color': '#1d4ed8',
+            'target-arrow-color': '#1d4ed8',
             'font-weight': 'bold'
         }
     },
@@ -55,3 +58,4 @@ export default [
         }
     }
 ]
+export default styles;
diff --git a/src/lib/stores/journeyStates.ts b/src/lib/stores/journeyStates.ts
new file mode 100644
index 0000000..f5d7888
--- /dev/null
+++ b/src/lib/stores/journeyStates.ts
@@ -0,0 +1,74 @@
+import { writable } from 'svelte/store';
+import type { Readable, Writable } from 'svelte/store';
+import type { DragItemID, IDragItem } from './layoutStates';
+import type { LGraphNode, NodeID } from '@litegraph-ts/core';
+
+/*
+ * A "journey" is like browser history for prompts, except organized in a
+ * tree-like graph. It lets you save incremental changes to your workflow and
+ * jump between past and present sets of parameters.
+ */
+export type JourneyState = {
+    /*
+     * Selected drag items.
+     * NOTE: Order is important, for node grouping actions.
+     */
+    currentJourney: DragItemID[],
+
+    /*
+     * Hovered drag items.
+     */
+    currentHovered: Set<DragItemID>,
+
+    /*
+     * Selected LGraphNodes inside the litegraph canvas.
+     * NOTE: Order is important, for node grouping actions.
+     */
+    currentJourneyNodes: LGraphNode[],
+
+    /*
+     * Currently hovered nodes.
+     */
+    currentHoveredNodes: Set<NodeID>
+}
+
+type JourneyStateOps = {
+    clear: () => void,
+}
+
+export type WritableJourneyStateStore = Writable<JourneyState> & JourneyStateOps;
+
+function create() {
+    const store: Writable<JourneyState> = writable(
+        {
+            currentJourney: [],
+            currentJourneyNodes: [],
+            currentHovered: new Set(),
+            currentHoveredNodes: new Set(),
+        })
+
+    function clear() {
+        store.set({
+            currentJourney: [],
+            currentJourneyNodes: [],
+            currentHovered: new Set(),
+            currentHoveredNodes: new Set(),
+        })
+    }
+
+    return {
+        ...store,
+        clear
+    }
+}
+
+export type JourneyStateStaticOps = {
+    create: () => WritableJourneyStateStore
+}
+
+// These will be attached to workflows.
+const ops: JourneyStateStaticOps = {
+    create
+}
+
+export default ops
diff --git a/src/lib/stores/workflowState.ts b/src/lib/stores/workflowState.ts
index 559a969..1b9e030 100644
--- a/src/lib/stores/workflowState.ts
+++ b/src/lib/stores/workflowState.ts
@@ -12,6 +12,8 @@ import type { SerializedAppState, SerializedPrompt } from '$lib/components/Comfy
 import type ComfyReceiveOutputNode from '$lib/nodes/actions/ComfyReceiveOutputNode';
 import type { ComfyBoxPromptExtraData, PromptID } from '$lib/api';
 import type { ComfyAPIPromptErrorResponse, ComfyExecutionError } from '$lib/apiErrors';
+import type { WritableJourneyStateStore } from './journeyState';
+import journeyStates from './journeyStates';
 
 type ActiveCanvas = {
     canvas: LGraphCanvas | null;
@@ -115,7 +117,12 @@ export class ComfyBoxWorkflow {
     /*
      * Completed queue entry ID that holds the last validation/execution error.
      */
-    lastError?: PromptID
+    lastError?: PromptID;
+
+    /*
+     * Saved prompt history ("journey") for this workflow
+     */
+    journey: WritableJourneyStateStore;
 
     get layout(): WritableLayoutStateStore | null {
         return layoutStates.getLayout(this.id)
@@ -133,6 +140,7 @@ export class ComfyBoxWorkflow {
             title,
         }
         this.graph = new ComfyGraph(this.id);
+        this.journey = journeyStates.create();
     }
 
     notifyModified() {