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Look at the resulting square and you'll see that all rows and columns total 37 - the spectators chosen number. Also, both diagonals total 37. The numbers at each corner also total 37. And the four 2 by 2 squares at top left, top right, bottom left and bottom right also total 37 (e.g. 8, 11, 16 and 2; 17, 1, 7 and 12 etc.)!

Actually, there's more! Choose any 3 sided square and the numbers at each corner also total 37 (e.g. 8, 17, 3 and 9)!

Although this may seem like a simple concept, Derren Brown used a magic square effect as the encore for his 2004 UK tour and got a standing ovation!

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