Milk Scanner
A 3D scanner using a tray of milk. The item submerges, you watch the pixels turn white and log the Z axis. It was inspired by .. uh, I can’t find the link right now but it wasn’t the first.
Here’s a link to another one that someone made 7 years later.
SFM techniques made this approach worthless, but it’s still pretty cool.
If I can find the code I’ll link it somewhere