(Continued)

Bogart and Lorre in 'Casablanca' with chessboard and cocktail

The key is the cocktail that begins the proceedings.”

– Brian Harley, Mate in Two Moves

See also yesterday's Endgame , as well as Play and Interplay
from April 28…  and, as a key, the following passage from
an earlier April 28 post

Euclidean geometry has long been applied
to physics; Galois geometry has not.
The cited webpage describes the interplay
of both  sorts of geometry— Euclidean
and Galois, continuous and discrete—
within physical space— if not within
the space of physics .