… or what you get if you video concentric RGB LED rings and put them out of focus.

work as if you live in the early days of a better nation
Yes, it’s a very tiny microcontroller board and breadboard doohickey. The board’s a Trinket M0 running CircuitPython 2.0. The base is laser-cut birch ply. Definitely #smol at less than 75 × 55 mm …
Here’s the SVG for laser cutting:
To build it, you’ll need:
If I were to redesign this, I’d:
Obligatory blinky code for running a 16 LED NeoPixel Ring and the LED in the middle of the Trinket: