A flock of giant spherical drones move in response to visitors inside London's Roundhouse, which is hosting the latest installation by Rain Room creators Random International.
The Zoological installation forms part of a programme of events at the north London theatre named +/- Human and curated by choreographer Wayne McGregor.

Visitors can engage with the installation throughout the day, although on Friday and Saturday evenings it also doubles as the setting for a new dance work created by McGregor and his company.
Zoological sees a crowd of inflated balloons ? described by Random International as "organisms" ? equipped with propellors buzz around the circular space.
The drones' path is determined by an algorithm, which dictates that they move around in a flocking formation. Motion sensors pick up on visitors moving around the space, forcing the drones to follow.
"We wanted to create this organism, this artificial life form which lives in the space, floats and moves around and reacts to people," Random International co-founder Hannes Koch told Dezeen. "We'd been thinking about ways of somehow making swarming or flocking behaviour more physical and more tangible."
"We always wanted to do it kinetically, and to stimulate something that is airborne. So that's what we looked at ? helium-filled balloons that fly collectively according to flocking and swarming behaviour."

Koch believes that the way his team has managed to control the dr...