Answer:
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?
I work when I play and play when I work.
Big as a biscuit, deep as a cup, but even a river can’t fill it up. What is it?
What is it that no man ever yet did see, which never was, but always is to be?
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
What gets broken if it’s not kept?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?