Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
A father's child, a mother's child, yet no one's son
It has the biggest wall and is also used when drinking tea.
Longer than a decade and shorter than a milennium
It can be done to buttons and shopping carts. What is it?
Cycle Cycle Cycle.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?