My thanks to Ian, who brought these useful articles to my attention.
Aspect Ratios:
https://photography.tutsplus.com/articles/the-art-of-using- aspect-ratios-in-digital- photography--photo-7947
https://www.woodst.com/web-design-development/what-is- image-aspect-ratio-and-why-it- matters-a-lot/
The Golden Ratio: http://emptyeasel.com/2009/01/20/a-guide-to-the-golden- ratio-aka-golden-section-or- golden-mean-for-artists/
https://en.wikipedia.org/wiki/Golden_ratio
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