What Foot Feature Makes a Pair of Feet Instantly Recognizable?

We've all seen hundreds (or thousands) of feet over the years, but every once in a while you come across a pair that you'd recognize immediately.


Not because they're "perfect," but because they have something unique.


Maybe it's a distinctive toe shape, a certain instep, unusually thick soles, unique wrinkles, or even the way the feet move naturally.


What's one feature that makes you instantly recognize a model without seeing her face?