The penis is so different! This is my initial motivation, to study one of the oldest and probably the most attractive thing that humans interact with.
The Penis Wall is made up of 3D printed penises that each have six segments driven by servo motors. Equipped with an ultrasonic distance sensor, each unit can respond to a viewer's movements. Moreover, the Penis Wall can also be used as a display to represent data, for instance, fluctuations in the stock market.
Photos on the Google Doc