Hold
Fix one thing; change all the rest.
The grid stays; every element on it is redrawn.
Seen in Henry Purcell, "When I am laid in earth", Dido and Aeneas, by July 1688
Try it on your work
Pick one element of the thing you are making and fix it exactly: the grid, the palette or the outline. Make five versions in which everything else changes. Stop at the fifth; any version in which the fixed thing moved does not count.
Choose one sentence from your notes and keep it word for word. Rewrite the paragraph around it six times, each time from scratch. Stop at the sixth; the sentence never changes.
A group agrees one thing nobody may change: a date, a budget line, a shape on the wall. Anyone may change anything else. The round stops the moment someone proposes moving the fixed thing.
How it has been used
Fix one thing and change everything else around it: the grid held while every element on it is redrawn, the melody kept while the whole arrangement is rewritten, the one word that stays while the sentence is rebuilt six times. The move forbids touching the fixed thing: the moment it moves, you are doing something else.
Where it leads
Grouped under Protect what still needs to work