I'm interested in making concept art, so what I've been doing for many years was take photos of stuff like this to save for later reference. However, what invariably happens is I take my camera home, copy files to my assets folder, and there they sit, almost never to be looked at again. This day I decided to try something different.
So I sat down on the grass, took out my moleskine, and started drawing this thing, whatever it is. I found as I completed the sketch I got so much more out of it than if I had taken a photo and moved on. The process of spending a half hour drawing this object helped imprint the shapes and connections onto my brain in ways that snapping a quick photo couldn't. So the next time you see something interesting and you're not in a big hurry, just stop, sit down, and draw the damn thing.