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6th Generation Impossible Objects (2016-)
"Deformable Objects" whose shape change as the viewpoint moves
If we move the viewpoint continuously, the objects appear to deform continuously.
For example, if we rotate an arrow facing rightward around a vertical axis by 180 degrees intending to make it face leftward, the arrow does not face reftward. Instead, it faces rightward again. The behavior is like that of molluscs.
The arrow is facing rightward. We cannot make it face reftward. Even if we rotate it around a vertical axis by 180 degrees, it turns to the right again.
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We can make various shapes deformable.
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This arrow faces only toward you.
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When we rotate it by 180 degrees, it rotates by only 90 degrees.
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Various shapes are made deformable.
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Theory of the deformable objects can be found in the next reference.
K. Sugihara, Anomalous mirror symmetry generated by optical illusion. Symmetry 2016, 8(4), 21; doi:10.3390/sym8040021
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