In squares of order 4 where the numbers run sequentially from 1-16 the magic constant (the sum of a single line, row or diagonal) is 34, but Subirachs’ square does not contain the numbers 12 or 16 (see image, above). Instead, 10 and 14 are included twice, making a magic constant of 33, the age of Jesus Christ at the crucifixion.

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