Answer:
In the land of the green glass door there are riddles but no answers, sheets but no blankets, and books but no words. Name something found in the land of the green glass door.
Twigs and spheres and poles and plates. Join and bind to reason make.
Pregnant every time you see her, yet she never will give birth.
I am what remains when nothing is left.What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
You use it between your head and your toes, the more it works the thinner it grows.