Sea-Ling’s Modern Math. Richard Gerlitz, ca. 2005. Four decorated columns bearing chains of random digits are inserted into four tubes with long windows. Any set of numbers on each column in chosen, and added together with the numbers on the other columns. The magician always correctly predicts the total, no matter what numbers are chosen even though thousands of combinations are available. A stunning prop. Stand is 3 by 9 inches and tubes are 6 inches high. With original instructions. Fine condition..