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Leonardo da Vinci
The two
squares, the drawn and the projection
square, form an octagram Pell's
series are the progressions
that approximate the geometry of
proportions originating from the
octagram The first of Pell's series is:
1
2 5 12
29
70 169 ...
Both main numbers 24 (2x12) and 29 are members of this series. Leonardo used this progression to rationalise irrational geometry of square root of 2 that rules the geometry of the octagram.