Merge
Combine until no seam shows and neither part can be got back.
Copper and tin, then only bronze.
Try it on your work
Knead two colours of clay together until no streak of either shows. Stop when no streak can be found.
Take two sentences that say different things and write one sentence from which neither can be recovered. Stop when nobody could say which words came from which.
Two groups each draft a rule; together they write one rule in which nobody can say which part came from which group. Stop when a reader from outside cannot tell.
How it has been used
Combine things until no seam can be found and neither can be got back: the alloy, the blended colour, the face averaged from several. The move forbids a visible join: if a part can still be traced to where it came from, keep going.
Where it leads
Grouped under Help the parts agree