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Blind person cannot distinguish things by using his or her eyes, his or her tactile sense becomes more sensitive.
Because the heat makes expansion and the cold causes contraction, the Braille will also change with the temperature to help the blind person to notice the difference of his or her environment.
Raised to sensing temperature is high, careful attention to scald.
It dented to sensing temperature is low, water will be cold.
Li - Ying Hsu Pin-Jie Zhou Bao-Ching Ho Bao-Han Ke