Answer:
What is lighter than what it is made of?
Who lives in a house with one bedroom, 50 hallways, and ghosts lurking everywhere?
Sometimes black, sometimes white, I have veins but no blood
What is the freedom of birds and the pen of old men?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
What did the piece of wood say when he saw the screwdriver and screws approaching?