Build a device that lets Hanna change pens independently

About Hanna

Hanna 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. Hanna has tetraplegia, which causes paralysis of her hands.

Challenge

Hanna 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. Hanna would like a device that allows her to change pens independently, so she can choose different colors and draw and write more freely.