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Optical Stain: Amplifying vestiges of a real environment by light projection

Vestiges in the real world convey tacit information that can be clues for understanding activities occurring in one's surroundings. In this paper, we define such information that helps us understand our surroundings as "real-environment-oriented awareness information". However, it takes a long time for some vestiges to emerge, and there may not even be any vestiges remaining, depending on the situation.