Comment by anigbrowl

18 hours ago

Proportions absolutely matter for displays, both for aesthetic comfort and for efficient scaling. Most of the world uses ISO216 and its pleasing 1:sqrt(2) proportions. Leveraging aspect ratios with wide acceptance is a win both psychologically and for graphic designers.

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anigbrowl

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spappal  18 hours ago

The algebra proving why "halving long side H and flipping maintains aspect ratio" implies a ratio of 1:sqrt(2):

    H/W = W/(H/2)       (halving long side H and flipping maintains aspect ratio)
        = 2W/H          (multiply numerator and denominator by 2)
    H²  = 2W²           (multiply both sides by HW)
    H   = √2·W ≈ 1.41 W (take the positive square root; H, W > 0)