There have been multiple times in my life when I've wanted to see a physical reference image for something I can picture in my head, and I've found a perfect match by conducting iterative Google image searches using carefully-worded search terms. Not just, "That image I found is good enough," but, "That image I found is exactly what I was picturing in my head!" (If your wondering how that's possible, it usually happens when I'm imagining how something I read in a book would look, and I discover a visual artist who read the same book and pictured it exactly the same way I did.)