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Quantity
1
Description
This is a very powerful optical illusion. Place the mask upright, ideally with some back illumination – you can either stand the mask on a window ledge, or place a small light behind it. View the mask from the concave side, in other words w...
Reviews
5.0
7 ratings
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My second one!
I’ve had one for 25 years and it had become brittle and discoloured. I used it a lot in my teaching career to help students understand the fragility of perception and assumptions. Now, long into retirement, I just had to have a new one.
M
Mike · November 14, 2025
Brilliant Optical Illusion
The mask is large, solid, and creates a truly bizarre optical illusion. I teach philosophy and use it with my students as a brilliant example of how our senses can deceive us. Students love it.