By invitation only, several hundred artists create original artwork on Post-it Notes for a special gallery event in December each year the Giant Robot 2 Gallery in Los Angeles, CA. I've participated since 2015. It's an amazing event, I encourage everyone to check out the gallery's Instagram (@giantrobotstore) or blog for updates!
Post It Show Fifteen: Pterippus: The World Flying Horses
All artwork rendered in brush and inks.