Diffusion Choir is a kinetic sculpture that uses 400 folding elements to reveal the movements of an invisible flock of birds. Its movements are always changing, driven by custom software running a flocking algorithm. The sculpture hangs in the atrium of 650 East Kendall Street in Cambridge, Massachusetts, and was commissioned by BioMed Realty. Diffusion Choir was created by Sosolimited, Plebian Design, and Hypersonic