What Am I Riddles

Question: Different lights make me strange,
for each one my size will change.

What am I?

Question: I'm the eyelid to your life and hide you when you're inside.
You can draw me and you can pull me, but you must leave to see my good side.

What am I?

Question: I can hurt you unbearably and can't be touched. What am I?

Question: I am shorter when I stand and taller when I sit.
Sometimes I'm even called a pit.

What am I?

Question: Filled with garb,
the price is free.
Just return what you don't need.

What am I?