Love this. Tauba Auerbach and Cameron Mesirow (Glasser) collaborated on a pipe organ that cannot be played alone.

The Auerglass is a two person pump organ created by Tauba Auerbach and Cameron Mesirow. The instrument cannot be played alone. Each player has a keyboard with alternating notes of a four octave scale. Each player must pump to supply the wind to the other player’s notes.

The Auerglass at taubaauerbach.com