❦ is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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The most important computer graphics terminology on one single sheet of paper: https://octodon.social/media/LYwggJtvZxMrRa1ZB8o
(btw, got it via http://pbs.twimg.com/media/C6USK0gWYAEKvtb.jpg, but I only saw it printed on paper without further source.)
