• heeplr@feddit.de
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    1 year ago

    I only know thumb = motion/current but now since you say, it’s clear: people used x/y for 2D logically but the 2D plane used to be paper. which is parallel to the earth surface (usually). Computer screens are perpendicular so Y points up, not away from you.

    So this makes sense with paper, TIL. With computers, Z traditionally means depth.