Can progress come from failure? With the Evolution it can. The more you erase, the more it evolves! Start with the ape end of the eraser to see it gradually change into a human being,or use the other end to see the process reverse itself.Enjoy watching mankind's long evolutionary journey sped up to a mere instant,whenever you want! it's more than just an eraser too--- it's both a stamp and nice little decoration! Try it out!