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Benjamin Franklin - Magic Square of Squares and Magic Circle of Circles, “The Tables and Tracts Relative to Several Arts and Sciences”, 1767.

A magic square is an arrangement of numbers where each row, column and diagonal add up to the same number. Franklin’s square is semi-magic (where just the rows and columns add up to the same number), but created a novelty in bent rows summing to the constant. This 16-square was described by his friend James Loggan as “the most magically magical of any magic square ever made by any magician”.