Overview
Some ideas are easier to hold in your hands. These are 3D-printed models I have designed to make a piece of mathematics physical, each with an interactive 3D model you can turn, take apart and run in the browser, along with the files to print your own.
A geared clock that draws a 2×2 matrix. Turn the crank and the purple hand sweeps a unit vector x while the red arrow follows Ax; when the two line up, x is an eigenvector. Three swappable matrix sets.