This picture shows the difference between a foot with Fibrodysplasia Ossificans Progressiva (FOP) and one without. The right model is a normal foot and the left is the malformed one. Typically, people who have this genetic disease do have malformation on both feet, though I chose to just make two different types. The easiest tell-tale sign of this disease is how the two big toes on each foot are concaved and formed towards the other toes.