Answer:
I may seem real but it always turns out I was never there in the first place... you only see me during a certain resting stage.
I love spinach.
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
I go around a yard but does not move.
I am the kind of nut that is empty at the center and has no shell.
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.