One station controls the height of the sphere, another its angle, and a third lets you pick the pattern displayed on the LED ring.

ENGADGET: Visualized: Kinetisphere takes Nexus Q into another dimension at Google I/O 2012 (video)

The station, now circling at a height of 342km, needs a regular re-boost to keep it from falling back to Earth.

BBC: Freighter boosts altitude of ISS

Most Tory MPs also realise that a block-the-fire-station blackmail strategy, unleashed at the height of a global economic crisis, is risky.

ECONOMIST: Bagehot

Coming as it did at the height of disco fever, it became a staple of every music radio station and is still widely played, 30 years after its release.

BBC: Obituary: Gerry Rafferty

The tunnel served the Butterley ironworks, near Ripley, which at its height employed 10, 000 people and provided much of the metal for St Pancras railway station in London.

BBC: Butterley tunnel gets Scheduled Ancient Monument status