Condensed sunbeams

Some alchemists even considered gold as condensed sunbeams [1] and used to represent it by the symbol of a circle, the hallmark of mathematical perfection. Let us recall in this respect, e.g., the Golden Section in geometry, the concept of a gold number in colloidal chemistry after R. A. Zsigmondy (Z. Anal. Chem. XL, 697 (1901)) and J. B. Richter and M. Faraday (Phil. Trans. CXLVII, 145 (1857), and the Golden Rule in quantum theory. 

It is with words as with sunbeams—the more they are condensed, the deeper they burn. 

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