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Professor Tachi's cloak works by projecting an image onto itself of what is behind the wearer.
A computer generates the image that is projected, so the viewer effectively sees "through" the cloak.
The key development of the cloak, however, was the development of a new material called retro-reflectum.
"This material allows you to see a three-dimensional image," Professor Tachi said.
"This material is the key to our technology."