Here’s a tool for visualizing complex functions, which are important in scientific data analysis, but sometimes tough to grasp because with real and imaginary parts for input and output, they have 4 dimensions to plot. This program lets you explore input and output with motion and a new color scheme.
Here is a clock that displays solar noon, solar midnight, sunrise, and sunset, with colors to represent solar elevation. (Coming soon: moon position and phase).
Now that they are reliable and affordable, 3D printers are pure pleasure that I wish I had as a kid. Here are useful parts I print in the lab.