Law Enforcement

After going to this place, we went to the projects to watch a group of physics students conducting field tests on the descent rate from 15 floors of various pieces of household furnishings, up to and including love seats.

Doors...

Door(noun) A swinging or sliding barrier by which an entry is closed or opened. A means of controlling access, ingress and egress.
What do you see when you look at a door?
I have no idea why I'm drawn to doors, maybe it's because it's a way "out", or maybe it's their symmetry, or maybe because it's a way "in", or maybe it's because of the unique noise they make when violently separated from all the hardware holding it in place(some physics students told me about the noise). What ever the reason may be, I take a lot of pictures of doors. And it really doesn't matter what I see, what do you see?