As computer technologies were also centralised in a mainframe, defence systems worked from one giant computer deep in the mountains.

The latter effectively places the 13 dancers inside what feels like a giant computer, their performance existing side-by-side with digitally-generated outlines of dancers in motion.

It's a test rig based on a hexapod with six computercontrolled actuators, and it's like sitting in a giant computer games console in front of three huge screens.

One character even suggests the city may have been created by a giant computer, and that they are all just 'little simulated beings…who sincerely believe they're truly alive'.

There are no physical robots in this league but spectators can watch the action on a large screen, which looks like a giant computer game.