This article: http://www.intmath.com/numbers/math-of-beauty.php
suggests that the ideal ratio is about 1.6:1 (phi), a closer ratio to 1.5:1 (6x4) than 1.33:1 (4x3). The Mona Lisa has a ratio of about 1.4:1 (close to the square root of 2) (31x20), about half-way between. European A4 paper has a ration of 1.414:1 (square root of 2)
I suspect both the square root of 2 and phi have influence over our perceptions, and either could be considered part of the norm.
In movies, where horizontal action is emphasized, wider aspect ratios are used to good effect, but have never translated well to still photography.
IMO, aspect ratio depends mostly on the subject and composition. However, I nearly always prefer wider formats such as 2:3 and 1:2. Much wider than that and the narrow side becomes constrained for most subjects, IMO.
Before 135 existed, 127 and 120 both used the same aspect ratio. I suspect Leica used 24x36 to match them.I would suggest that as 35mm cameras and film, before digital were the most numerous cameras used worldwide, it would allow that aspect ratio to score the greatest hits of revered compositions.
Many paper size standard are 5:4 rather than 4:3. 8x10, 11x14 are closer to 5:4 than 4:3.
There are some physiological factors that influence the question - things like the fact that we have two eyes (not one).
I expect, however, that the preferences for particular ratio are related as much to what we encounter and therefore are most familiar with.
Despite what Fibonacci might prefer
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