They found that the herringbone pattern hides the grid pretty well and cheaply, relative to other options.
They also credit Sean Barrett's prior work: https://nothings.org/gamedev/herringbone/herringbone_tiles.h...
Herringbone Wang Tiles - https://news.ycombinator.com/item?id=7999392 - July 2014 (10 comments)
They found that the herringbone pattern hides the grid pretty well and cheaply, relative to other options.
They also credit Sean Barrett's prior work: https://nothings.org/gamedev/herringbone/herringbone_tiles.h...