Equal Lines
Two lines, a few fins, and a question that is easier to answer than it looks.
How to play
Look first, then answer
Two lines, a few fins, and a question that is easier to answer than it looks.
- Under a minute · one question · then the explanation
How it works — best read after you have tried it
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.