What is computation?

Laputa, from Gulliver's Travels. Home of the hopelessly rational people who 'If they would, for example, praise the beauty of a woman, or any other animal, they describe it by rhombs, circles, parallelograms, ellipses, and other geometrical terms.' What is computation? Most would say it has something to do with the internet, with adding up numbers, with AI image manipulation. They might think it…