Like a Rubik's Cube

Looking at certain stones made me think of dealing with a Ruby's Cube. Looking at many different planes one after the other. They are not simple stones. With a slight change of angle or a slight change of light, the beak of a bird becomes the mouth of a bear for example. On one " side", an animal, on the other a face. Or a face within a face. Sometimes very very small. I have never solved a Rubik's cube nor ever had the inclination to solve one. But these stones offer a challenge. I don't know anything like these.