This Arrow Always Points to the Right, Even if You Rotate it 180 °. How is This Possible?

The "stubborn" arrow was made by the mathematician Kokiti Sugihara from the Meiji University. The arrow points to the right, even if you rotate it 180 °. In this case, the figure looks symmetrical from above. Optical illusion is obtained due to the peculiarities of the relief.

And if you place a mirror behind the arrow, it will always show to the left in the reflection. Here's how it looks.

Sugihara is the author of several dozen optical illusions. For example, here is a canopy over the parking space. In reality, it is concave, and in mirror reflection it is sloping.

Here are triangular, at first glance, figures that look round in the mirror!

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