The width/height ratio of credit cards is the golden ratio
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+bonifartius 𒂼𒄄
@valleyforge isn't it ID2? that is equal to A7 which has a ratio of "1 / sqrt(2)"
@valleyforge but 1/sqrt(2) is just close to golden, squareroot of 2 is ~ 1.41, golden ratio is ~ 1.61. they both have interesting properties though :)
@bonifartius Yes metric paper uses the golden ratio