Elbows
In a dark unlit room that had been the pipe-fitters shop, I ran across a rack of three shelves filled with these 'elbow pipes' that looked as if no one had touched them since the plant closed in 1978. There they were, just waiting for someone to stick their hand in, grab one, and make good use of it.
It was so dark in the room that I had to frame up what I guessed might be a nice composition, make a long exposure, and see what the results looked like on the LCD of the camera. Then I kept making adjustments until I came up with a composition that seemed to 'work'.