[Nick] is working on a prototype of a coffee table sand plotter that draws patterns in sand a lot like a zen rock garden. [Nick]’s zen rock garden uses a magnet to draw a ball bearing across ...

On top of the table, a metal sphere attached to the magnet moves through craft sand to draw attractive patterns. An Arduino and Raspberry Pi work together to command the stepper motors to create ...

It's built using an existing table that's been fitting with a Raspberry Pi, a motor, a magnet, and housing for the sand so that a metal ball can be moved about the bottom to draw the images.