strangely mesmerizing… http://chir.ag/stuff/sand/
The four streams falling down are sand, water, salt, and oil. You can turn them off or increase the streams using the multiplier controls at the bottom. Fire burns oil, plants, and ceramic; salt floats on water, water floats on oil; water makes plants grow. Check the linked pics at the top of the site’s page for some samples of what you can do.
Oh, and ??? destroys everything but plants.