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I often use doors as the introduction to understand affordances. It's crazy that we've had doors for 5000 years and we still make them hard to open.

See "Norman Doors": https://www.youtube.com/watch?v=yY96hTb8WgI

The Design of Everyday Things: https://en.wikipedia.org/wiki/The_Design_of_Everyday_Things

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What time do they specifically describe the Norman Door? I skipped around in the video and I got the general point (doors, like everything else, should make invalid options not look valid), but I couldn't stand the video's style enough to sit through the whole thing.

All the confusing doors they show are "Norman Doors":

> A so-called “Norman Door” has design elements that give you the wrong usability signals to the point that special signage is needed to clarify how they work. Without signs, a user is left guessing about whether to push or pull, creating needless frustration.

(from the 99% Invisible page)

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