Answer:
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I am in the middle of water but am not an island.
Send poorly behaved children to me and let them sit here.
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
A little house full of meat, no door to go in and eat.