This extraordinary painting of Fra Luca Paccioli, shown below, painted by J de Barbari (1440 -1516) gives us a historical summary of many fascinating elements of the Golden Proportion under the following five headings.
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The painting shows Paccioli (5) with an intense gaze on the suspended solid transparency (3) relating it to a text and a drawing on a slate (2) showing Euclid's name.