Galleries are forbidden places once the lights are turned out at night. After Dark was a prize-winning installation from The Workers, a studio in East London, which wandered the empty Tate Modern and Tate Britain at night in London last year. With Raspberry Pi for brains.
You can learn more about the project at AfterDark.io. We wish we’d known about it when it was happening, but happily, there’s a chance that the robots will reappear in another gallery in the future; we’ll be keeping an eye on their website in case that happens.
(Space geeks should watch this one to the end; the first operator of the system once it went live was a certain Commander Hadfield.)