Four men cross a London street in single file, and that is the entire front cover. The Beatles walk right to left over the white bars of a zebra crossing, and one of them, Paul McCartney, has no shoes on. There is nothing else: no band name, no album title, not a word of type anywhere on the front of Abbey Road.

This is a real crossing on a real road, four real people caught mid-stride on an ordinary sunlit morning. It was also among the last photographs to show all four Beatles together. That knowledge gives the small procession its weight: not a staged spectacle but a walk, over in seconds, that turned out to feel like a kind of ending.

How the image was made, why it carries no title at all, and what fans later claimed to see hidden in it are the questions the rest of the sleeve answers.