The 4 × 4 magic square from Albrecht Dürer 1514 engraving  – also found in a 1765 letter of Benjamin Franklin – is also associative, with each pair of opposite numbers summing to 17.
The 4 × 4 magic square from Albrecht Dürer's 1514 engraving – also found in a 1765 letter by Benjamin Franklin – is also linked, with each pair of opposite numbers summing to 17.