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It consists of calculations etched largely in ink on yellowed leaves of foolscap and squared paper, with 26 pages in Einstein’s handwriting, 25 pages in Besso’s and three containing entries from both scientists.

To create a pixel art portrait, start by printing out a picture of yourself or a family member and then print out some squared paper.

The bare stage decor is a vast backdrop of squared paper, like the grid of a New York street map, and against this a cast of two-dozen dancers are drilled into epic, geometric formations – an army of urban workers who walk, jog and bounce in fiercely repeating phrases.

Penultimate, for example, even has the temerity to reproduce the squared paper that is one of the Moleskine's specialities, not to mention the soft covers of the smaller Moleskine notebooks.

Perhaps this is why iPad note-taking apps offer skeuomorphs of yellow legal pads, squared paper, ring-binders, etc.