In about 800 AD, during the Tang dynasty (618–907), a book entitled Record of Ancient Mirrors described the method of crafting solid bronze mirrors with decorations, written characters, or patterns on the reverse side that could cast these in a reflection on a nearby surface as light struck the front, polished side of the mirror due to this seemingly transparent effect, they were called "light-penetration mirrors" by the Chinese. If that light is reflected from the mirror towards a wall, the pattern on the back of the mirror is then projected onto the wall.
When bright sunlight or other bright light reflects onto the mirror, the mirror seems to become transparent. The front is a shiny polished surface and could be used as a mirror, while the back has a design cast in the bronze. The mirrors were made out of solid bronze. The Chinese magic mirror ( simplified Chinese: 透光镜 traditional Chinese: 透光鏡 pinyin: tòu guāng jìng) is an ancient art that can be traced back to the Chinese Han dynasty (206 BC – 24 AD).
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