Answer:
What can you catch but not throw?
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
Iām hard as a rock and as light as a feather. Iām passed on to one another. Poor people need me and rich people have me.
I start in little but I end in full you'll find me in half and complete.
What made Cyclops quit teaching?