The drawing, surely from the hand of Vasari himself, is a study for an Allegory of Earth painted by his assistant Cristofano Gherardi in the Sala degli Elementi, Palazzo Vecchio, Florence. There are a number of differences between the preparatory drawing and the finished fresco. Vasari supplied a full description of the complex symbolism of this allegorical composition that is dominated by the figure of Saturn holding up a serpent that bites its own tail. This circular symbol is said to be an Egyptian hieroglyph, symbolic of the rotundity of the heavens among other things.

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