It’s the fabric, the movement. It’s that whole “physics of superheroes” thing. How fast is the cape moving when he’s flying? How does the cape respond to speed – casual speed, supersonic speed? It was one of the first things we asked Sony Pictures Imageworks even before we started: Can you guys make a realistic cape? They went off for six months and then showed us this amazing stuff, and we thought, OK, this will look real.