Need a new project….thinking of doing something like this…It is a small stainless steel ball which appears to roll magically over sand and leaving nice patterns in the sand like to some Japanese Zen garden techniques. It is like a frame with a concealed robotic arm to drive a magnet moving the ball from below the sand.
Will document over the next few weeks how I am progressing and what I am doing. Given it is computer controlled, I envisage to place a stone in the sand as well and make sure the ball can avoid it.
I obviously, there is a fair amount of internet browsing.
been doing some research and found this
and this
https://www.geogebra.org/m/uxc2G78E
need to start with some design in Fusion 360….
More research : 
