The Third Thumb is a 3D printed thumb extension for your hand, controlled by your feet. The project investigates the relationship between the body and prosthetic technology in new ways. It is part tool, part experience, and part research; a model by which we better understand human response to artificial extensions. The Third Thumb instigates a necessary conversation about the definition of ‘ability'. The origin of the word ‘prosthesis’ meant ’to add, put onto’; so not to fix or replace, but to extend. The project is inspired by this word origin, exploring human augmentation and aiming to reframe prosthetics as extensions of the body.