Damn you helped me go down a thread of thoughts. I know everything is dialectical, of course, but teaching dialectics through explaining convergent evolution seems like such an easy method. When a problem/force exists in the material world, it effects the development of all things interacting with it in different but converging ways, turning many things into crabs.

Also why is crabs the saying? Look how many things start crawling and sliding around like worms and snakes. Everything loses legs and goes on it’s belly too. Or fish shape, that one comes back everywhere too. And the rat/rodent shape. Super efficient too.