Answer:
The strangest creature you'll ever find has two eyes in front and a hundred behind.
Walk on the living, they don’t even mumble. Walk on the dead, they mutter and grumble
I build up castles. I tear down mountains. I make some men blind. I help others to see.
Halo of water, tongue of wood. Skin of stone, long I've stood. My fingers short reach to the sky. Inside my heart men live and die.
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?