"The Gross Clinic" by Thomas Eakins, 1875 --- One of my favorites from my intro to art history survey course at Mount Holyoke College. The more you look at it, the more detail you see. Like the blood on the scalpel, so delicate! They used to conduct surgeries in an amphitheater so young doctors could learn surgical techniques. Oddly enough, the architecture building at Tulane used to be their medical building, and the auditorium for my intro architecture survey course was originally one of these surgical amphitheaters. I was at Tulane before MoHo, so that was really trippy!