Answer:
I mirror your actions.
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you. What am I?
What comes in many different sizes but is always only 1 foot long?
What goes up a chimney down but can't go down a chimney up?
What made Cyclops quit teaching?