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The opaque projector has been around for hundreds of years, basically starting as a camera obscura. A camera obscura was first used by the Chinese philosopher Mo-Ti who created an image that was inverted by light rays, which passed through a tiny pinhole in a dark room. This was the first use of a camera obscura. In 1490 Leonardo Da Vinci wrote of this type of camera in his notebooks. He also utilized them in his painting. The camera obscura eventually evolved into the opaque projector.