Goal and options: clay
output answer: can fit in shoe box

Goal and options: How do I easily carve a block of wood into a rounded bowl shape.
output answer: You need a tool called a lathe which rotates the wood while you carve it.

Goal and options: Make a hidden treasure box for fun and collect coins in it.
output answer:
Buy a large chopping block and take a router with a deep boring bit and cut out a large pocket are in the block.Then use a thinner cutting block and cut it down to sie to make the lid for it.