When, in the Middle Ages, the precious blue stone lapis lazuli arrived in Europe from the East, blue became the most exotic and mysterious of colours. And it was artists who used it to offer us tantalising glimpses of other worlds beyond our own.

In the Age of Reason, it was the rediscovery of the white columns and marbles of antiquity that made white the most virtuous of colours. For the flamboyant JJ Wickelmann and the British genius Josiah Wedgewood, white embodied all the Enlightenment values of justice, equality and reason.