HAHA (Hypertrophic Ambidextrous Hand and Arm) is a performance work that adds an extra robotic arm to the human body with hyperextension, ambidextrous motion and continuous rotation. Developed by Stelarc with Sorbonne University's ISIR, it turns the simple idea of “one more arm” into a full body-machine choreography.

The performer is physically connected to the system through a magnetic lock and controls the installation using an exoskeleton plus ECG and EMG sensors. The robot's motion also drives live video switching and sound generation.

Practicing badminton alone creates a simple problem: someone still needs to feed the shuttlecocks. This machine solves it by putting a compact Denso VS050 industrial robot arm in charge of shuttle delivery.

A pneumatic gripper picks one shuttlecock from a hopper and carefully feeds it between two high-speed spinning discs for launch. Even metal 3D-printed parts are involved, turning the everyday lack of a practice partner into something closer to a factory automation cell.