Answer:
I am black within and red without; with four corners round about. What am I?
I contain five little items of an everyday sort. You can find all five in a tennis court.
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.
I have a head tail but no arms and legs.
I reach for the sky but clutch to the ground. Sometimes I leave but I am always around.
What made Cyclops quit teaching?