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The error appears in what the bank describes as “microprint,” a miniature section of text, which in this case also doubles as the ground beneath a women’s and maternity hospital depicted on the note.

A diamond cat brooch was pinned to his tie, and his tight black pants were covered in a microprint of his own likeness, which ran up and down the leg and, from far away, looked like a thick pinstripe.

There is also microprint hidden inside the images.

A two-volume microprint edition has been available since 1971, but requires a magnifying glass to read.

He thinks the solution is already at hand, in microprint.