Dovetail Course
Pins and tails along a seam: the planar ancestor of the universal joint. Flare is how hard the lock bites; columns is how many keys fit the run.
About this pattern
The planar ancestor: pins and tails along a seam. Flare is the undercut that stops the joint pulling apart; columns is how many keys fit the run. Stacked courses are a timber wall, or a wallpaper of lock. Odd rows slide in motion, a sliding dovetail walking its groove.