Answer:
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
I turn everything around, but I cannot move. When you see me, you see you! What am I?
When I get closer my tail grows longer but when I go away my tail leads the way.
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
You can always find me in the past. I am created in the present, but the future can not change me. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.