Equal Lines
Two lines, a few fins, and a question that is easier to answer than it looks.
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Regardez d’abord, répondez ensuite
Two lines, a few fins, and a question that is easier to answer than it looks.
- Moins d’une minute · une question · puis l’explication
Comment ça marche — à lire plutôt après avoir essayé
The fins do the lying
Both lines are exactly fifty units long. Fins that point outward make a line read as longer, and fins that point inward make it read as shorter.
Nobody is sure why. One idea is that we read the fins as corners seen in depth, and correct for a distance that is not there.