OK adding this to the list of things to build

A sand/zen garden.  This looks easier to make than a CNC since its only two axis and a big magnet.  Making the “sandbox” maybe more of a challenge.  And as the article says, its been done other times too (I like one of the previous examples where the system “cleans” the slate”).

Zen and the Art of Arduino

Orignal site

https://www.hackster.io/MakrToolbox/zen-garden-cnc-end-table-b673f4

Other examples:

CNC Zen Garden

CNC zen gardening

Zen rock garden table uses magnets and sand