Answer:
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
The more you take of me the more you leave behind.
I begin your sentences. What am I?
What goes through towns and over hills but never moves?
What has a thumb and four fingers but is not alive?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.