I think its got more to do with the fact that it tells you're they're upside down, not the light build. Your brain then fills in the information its given to make it match the picture. It's the same as that video posted earlier where a phrase is repeated, and there's a bunch of different phrases written down. And the phrase being repeated will match whatever one you're reading at the time. That's also why eye witness testimony in courts has been proven to be pretty unreliable. The brain fills in and interprets things and stores in the information in ways that we're not even conscious of. We just like to think of it as a digital recorder when it isn't.
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