Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
Inside a great blue castle lives a shy young maid. She blushes in the morning and comes not out at night.
Beautiful girls strut and sexy men 'do their little turn' on this.
I am a precious little thing, dancing and eating all the time. Watch me from a distance, so you can feel my warm and gentle love. But don't come to close or my next meal you could be!
What did the piece of wood say when he saw the screwdriver and screws approaching?