A dwelling for your socks, hose, or ties. Flip me around, and I’ll show you a prize.

I tie two hearts, yet I’m traded for gain, I hold atoms close, and prisoners in chain. But give me a tux and a I can also be an agent beyond par.

I am used to enter, but I am not used to exit. You can find me in movie theaters and concerts.

On digits I'm all different, but come in three styles. I'm in every scripture, novel, each and all files. Blue ones of me are designers' magnum opus. To a specific machine, I am their focus.

I can take many forms, but my purpose is always the same. I can be way up high, or down below, and sometimes even inside. I hold those most precious to us, and some might try to rob me. Some feel free when I am empty. What am I?