Generative Geometry
Kaleidoscope
10-fold mirrored kaleidoscope of rotating polygon blobs on a deep plum background; tap/click spins the pattern and regenerates blobs.
canvasmedium complexitymoderate motionclick
Open on the canvas to copy the code → Free account · 3 copies a day · membership goes unlimited
Worth keeping?
Votes steer what gets built next — sign in to cast one, free to read
When to use it
Dark-mode hero backgrounds, screensavers, generative art showcases, or any ambient loop needing hypnotic symmetry.
When not to
Light-background UIs (background hardcoded dark plum). Contexts where users need to focus on text or UI controls.
Working with an AI agent
Every component ships agent-ready metadata. An example instruction for this one:
Change SEG from 10 to 8 for 8-fold symmetry, shift blob hues toward teal by replacing the random hue with a range of 150+Math.random()*80, and slow rotation by changing t*0.0002 to t*0.0001. Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.
Safe to edit
- segment count (SEG=10)
- blob count (M=7)
- blob angular range (a within ±0.45·ang, bouncing at ±0.55·ang — must stay inside the mirrored wedge or the blob is clipped away in every segment)
- rotation speed (t*0.0002)
- blob hue range (Math.random()*360)
- blob size range (0.05+Math.random()*0.1)
- spin impulse on click (spin+=0.4)
- theme tokens (:root dark defaults + [data-theme=light] overrides)
Keep intact
- IIFE wrapper
- prefers-reduced-motion guard (static draw on reduce)
- visibilitychange pause
- DPR-aware canvas sizing
- theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)
Known limitations
- Reduced-motion path draws a single static frame but still runs the rAF loop (blobs update silently)
- Background color hardcoded in both CSS and fillRect — must change both to retheme
- Blob hues are fully random on each init; no palette control
More Generative Geometry components
- Voronoi Shatter14 drifting sites partition the canvas into cool-blue Voronoi mosaic cells; moving the pointer nudges the nearest site toward the cursor.
- Auto-MazeDepth-first maze carves itself wall by wall on a dark grid with shifting hue; a bright dot marks the active cell. Resets with a new color on completion.
- Truchet Tiles8x8 grid of rainbow quarter-arc Truchet tiles that flip orientation in slow sine waves, weaving shifting interlocked curves across a dark background.
- SpirographA hypotrochoid spirograph traced progressively on canvas with a shifting hue; each cycle completes then resets with new random radii and color.
- L-System PlantAn L-system fractal plant grows branch by branch from the canvas bottom, swaying gently; clicking triggers a wobble and regrows a randomized plant.
- Rotating Mandala12-fold mandala of 5 nested polygon rings that counter-spin, breathe in scale, and cycle through lilac-gold hues. Tap adds a spin impulse.