Build a device that lets Hannah change pens independently

About Hanna

Hannah is seven years old and has just started school. She is very active and curious, loves drawing and writing, enjoys taking photos, and sometimes plays wheelchair football. Hannah has tetraplegia, which causes paralysis of her hands.

Challenge

Hannah loves drawing and writing, but due to the paralysis of her arms and hands, she cannot hold and change pens on her own. She currently uses a pen holder that has to be opened and closed manually with a screw, so she always needs someone to help her change pens. Hannah would like a device that allows her to change pens independently, so she can choose different colors and draw and write more freely.