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According to Dr. Youtz, sightless reading is possible because black print absorbs more heat and is warmer than the surrounding white page, which reflects heat very efficiently. While this may account for people 'seeing' with their fingertips or elbows, it does not explain how people such as Kuda Bux or Margaret Foos could see objects without coming in contact with them. This type of eyeless sight remains a fully documented - but so far inexplicable - mystery.