This quote comes from a book, can you give me the book's title or its author
Achilles (a greek warrior, the fleetest of foot of all mortals) and a Tortoise are standing together on a dusty runway in the hot sun. Far
down the runway, on a tall flagpole, there hangs a large rectangular flag. The flag is solid red, except where a thin ring-shaped hole has
been cut out of it, through which one can see the sky.
Achilles: What is that strange flag down at the other end of the track? It reminds me somehow of a print by my favorite artist, M.C. Escher.
Tortoise: That is Zeno's flag.
MCC