@futurebird lol yes
Playing with MS Paint years ago, I found it was easy to sketch natural-looking sedimentary stone. The Powder Toy has similar drawing characteristics; I used it to illustrate my own neighborhood karst 
Alas, crude drawing tools don't do diagonals well.
Why my basement floods by Matera_the_Mad
The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox game, it simulates air pressure and velocity as well as heat!
Powder Toy (powdertoy.co.uk)
The Powder Toy
The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox game, it simulates air pressure and velocity as well as heat!
Powder Toy (powdertoy.co.uk)