Answer:
What is round as a dishpan, deep as a tub, and still the oceans couldn't fill it up?
What does everyone know how to open but not how to close?
What has 4 eyes but canβt see?
I am black when I am clean and white when I am dirty?
I can move even when you are still. I can be one or many.
What did the piece of wood say when he saw the screwdriver and screws approaching?