From Magicpedia, the free online encyclopedia for magicians by magicians.
Crazy Compass or Chinese Compass is a little illusion, in which an arrow drawn on a card appears to change its direction.
Val Evans originated the plot with his marketed "Optegramma" in 1945. Milbourne Christopher came up with the road-sign inspector presentation, which was published it in Hugard's Magic Monthly (Vol. 9 No. 7, Dec. 1951, p. 873)Willane published his version as "The Chinese Compass" in Willane's Wizardry (1947)