The Cadence leg prosthetic looks like something Chell from Portal might wear, but it's actually specially designed for riding a bike. Design student Seth Astle just won the James Dyson award for Cadence, which helps give below-the-knee amputees the fluid leg movement necessary to pedal a bike efficiently.
![](https://grist.org/wp-content/uploads/2011/09/ebt-180x1501.jpg?quality=75&strip=all&w=180)