James Dyson says his inspiration was a drawing by the Dutch artist MC Escher (he of Gothic palaces where soldiers are eternally walking upstairs, and of patterns where birds turn into fish).

"One of these is an optical illusion that shows water going uphill and round and round the four sides of a square perpetually," he says. "I wanted to create a series of cascades that are all on the same level - an everlasting waterfall."

• How does Dyson make water go uphill?
• Escher's Waterfall
• Waterfall in Lego
• Waterfall in Balsa/Copper
  

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