In reading this weekend, I came across the word philtrum. I consider myself a savvy person, but I'd never heard of it. A body part never covered in various kindergarten and science classes? Color me amazed.
Turns out the philtrum is also known as the infranasal depression. In all my years of photographing myself, I've never concentrated on that area (as evidenced below). But now that I'm aware of what the Greeks consider the most erogenous spots on the body, I think I might pay a bit more attention to how the philtrum looks on different individuals.