How the portal illusion works

The first 100 people to use code SCIENCE at the link below will get 60% off of Incogni: https://incogni.com/science

This is a development of the barber pole illusion and is related to a few other illusions like the Mephisto Spiral (the spirals that won't come apart), the illusions ring and the rolling rings illusion.

Ada Cohen's 3D projects can be found here:
https://www.printables.com/@AdaCohen

You can buy the ring from Grand Illusions here:
https://www.grand-illusions.com/optical-illusion-ring-c2x21139886

My 3d printer is an Elegoo Neptune 2S:
https://www.elegoo.com/en-gb/collections/neptune-series-fdm-printers

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https://stevemould.com/books

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