“Diffusion Choir” is a kinetic sculpture commissioned by Biomed Realty for its building at 650 East Kendall Street in Cambridge, Massachusetts. Sosolimited partnered with Plebian Design and Hypersonic to design, program, and fabricate this unique artwork. The sculpture visualises the movements of an invisible flock of birds. Some 400 folding elements — that can independently open and close, controlled by custom software running a flocking algorithm — form a hanging volume in the sunlit atrium. On the hour, smaller groups of birds coalesce into a single entity. On each quarter hour, the birds gather and perform special choreographed gestures. The graceful breath-like movements of the piece create an open, contemplative space.