Lithops is an apparently unfinished program written by Ben Lambrechts.
Lithops (commonly called flowering stones or living stones) are true mimicry plants: their shape, size and color causes them to resemble small stones in their natural surroundings. The plants blend in among the stones as a means of protection. Grazing animals which would otherwise eat them during periods of drought to obtain moisture usually overlook them. Even experts in the field sometimes have difficulty locating plants for study because of this unusual deceptive camouflage.
TODO: details about patterns