There's an optical illusion hidden in San Francisco's Transamerica Pyramid
Briefly

The optical illusion known as the Zöllner illusion affects how our brains perceive the Transamerica Pyramid, causing distortions in how we visualize its shape.
The Pyramid Dreams project discovered that nearly 20% of children distort the structure of the Pyramid, often rendering it with an hourglass shape rather than its actual design.
This phenomenon isn't exclusive to children; adults also misinterpret the shape of the Transamerica Pyramid, showcasing a widespread perceptual error that can be seen in various murals and artworks.
Martin Banks, a professor emeritus at UC Berkeley, explained that our brains are prone to drawing faulty conclusions about structured shapes due to cognitive biases, like the Zöllner illusion.
Read at SFGATE
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