Lift a slime into a plume and watch the smoke part around it. Drop it through a waterfall, or into the spring to send a wave across the pool. Draw a dam, erase a hole, and see where the water goes. The material menus change how everything moves and looks.
These are the physics engines from Sluice, my mining game. Built on work by saharan, Pavel Dobryakov, and Macklin, Müller, and Chentanez. The source is here.