The size of an eyeball

This 1/250th of a second contains in its frame billions and billions of miles of black, thousands and thousands of miles of blue, and somewhere between one and two metres of human being, on whose visor – like the muddy print of a tennis ball on a window pane, or the reflection of a selfie-taker’s phone in her sunglasses – is the sun, shrunken almost to the size of an eyeball.