Answer:
What did the left eye say to the right eye?
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.
What kind of cup doesn't hold water
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
What has a neck but no head?
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.