I collect sea glass - bits of colored glass worn smooth by the sea, on the beach in front of the house where I live, in south Italy. I find mostly green (from transformed beer bottles), less brown (ditto) and rarely blue, yellow and white. No red yet. When I see a piece of colored glass sparkling among the pebbles, I get a little shot of pleasure in my brain (dopamine?). I also collect books, mostly non-fiction - on nature, science, gardening, wild plants, homeopathy. I had over a thousand books when I lived in NJ. I had to give most of them up (to friends, libraries and book sales) when I moved to Italy. I am a 72 year old self-diagnosed Aspergirl.