A Fascination With Keys

What is it about keys that intrigue people so?
Is it the mystery and secrets that surrounds them? Keys can unlock chests,cars,doors,safes and myriad of other things. I think people love keys because of the association the word holds to secret and personal things.
I am doing a line of jewelry right now based off of scrap book finding keys stamped with important words. Each word has its own symbolism but when combined with a key..the imaginative mind takes flight!
I need to go buy some more keys next pay day!
Lauren