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Microtrope

Undergraduate mentoring · PhD thesis · with Jarvis Thompson

LEGO · modularity · 3D printing · rapid prototyping · optical toys

Read with caution: this page contains a strobing video.

Microtrope modular LEGO disc and motorized base
The Microtrope: a modular LEGO-compatible zoetrope wheel and motorized base.

The play experience

Spin the wheel, peek through the slits, and watch a short 3D animation come to life. Swap LEGO minifigures and scene modules frame-by-frame to try new motions without rebuilding the whole toy.

The Microtrope in motion.

Design challenge

checkerboard timing disc for strobe sync
Checkerboard disc for timing and strobe sync.

Most zoetropes are fixed — one animation, one wheel, built once. I wanted to know whether a zoetrope could work like a toy system: modular, rebuildable, and easy to iterate on. LEGO bricks were a natural fit for that kind of hands-on prototyping — and at a small enough scale to call it a Microtrope.

What we built

With an undergraduate collaborator, I built a small modular zoetrope from LEGO and custom 3D-printed parts:

Microtrope prototype on the lab bench
Early prototype with motor, sensor, and LEGO wedge segments.

The key insight was modularity: instead of fabricating an entire new zoetrope for every animation, we could swap scenes wedge-by-wedge and reuse the same mechanical platform.

Fusion 360 CAD of light plate design
Light plate v2 modeled in Fusion 360.

Building the animation

sorted LEGO minifigure parts in bags
Minifigure parts sorted by color for scene building.

We curated LEGO minifigures and parts to build short looping scenes on each wedge of the disc — mixing off-the-shelf characters with custom poses and props to tell a micro-story across the rotation.

LEGO minifigure parts for the Microtrope
Minifigure components sourced for the animation.

What I learned

This project planted the seed for everything that followed in my PhD. The idea that scene boxes should be swappable — first with LEGO wedges on the Microtrope, later with magnets on a bike wheel — became the core design principle of the Audiotrope.

Technical stack

Related work

Audiotrope · PhD thesis