Calculus: Calculus game in progress. http://boardgamegeek.com/image/1178210 Calculus: A calculus match... http://boardgamegeek.com/image/1178203 Calculus: In play. http://boardgamegeek.com/image/725990 Calculus: My box with the cover - the cover acts as the board. http://boardgamegeek.com/image/725989 Calculus: The game - box, rules, and plastic tokens. http://boardgamegeek.com/image/725988 Calculus: White moves an old stone http://boardgamegeek.com/image/232277 Calculus: A tough game with my son. http://boardgamegeek.com/image/231982 Calculus: Calculus played on a tree stump with go stones. http://boardgamegeek.com/image/231916