Chinese mirrors.
These ancient mysterious bronze mirrors are called Chinese, although they have been found in Japan and Russia. However, most of these mirrors were found and are still found in China.
One side of them is absolutely smooth, and on the other there are various drawings and ornaments. These mirrors are well known to lovers of artifacts, but few people know that they have an incredible property - if a beam of light is directed onto their smooth side, the pattern that is applied to their reverse side will be reflected.
That is, these mirrors completely violate the laws of optics. At the same time, the reflection becomes voluminous, that is, it is a kind of 3D cinema of ancient times. It is still unknown how the ancient masters were able to achieve such an effect.
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