London product designer Dani Clode has created a prosthetic thumb, not to replace a missing digit, but simply to offer people an extra thumb, and therefore add to the human experience. She calls it the Third Thumb Project.
Clode uses bluetooth controllers in her shoes, which are connected to pressure sensors underneath her toes, to manipulate the thumb. "It extends the wearer's ability. It extends the wearer's self. It's an addition to the body," she says in the video.
The extra thumb allows you to easily do things like crack eggs, swipe an iPhone, and squeeze a lemon with only one hand instead of two. Now Clode is working on the Alternative Limb Project at the University College London with neuroscientists in a brain plasticity lab to design a prosthetic arm.