‘Dipping Duck Orchestra’ by Kitty Clark.
8 Dipping ducks (a.k.a happy birds, drinking birds…) and their respective drinking glasses are wired up to the 8 notes of a modified keyboard. Each time a duck tips down and touches the water to ‘drink’ the circuit is completed and a sound is produced. Being thermodynamic, the ducks continue to produce random compositions depending on temperature.

found at vvork