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When the blind pouring the water to drinks , they couldn't see how much water in the cup, and also don’t know the water position in the cup, so the water may overflow.
This cup is composed of two kinds of material.The inner layer is a flexible silicone material, the outer layer is made of ceramic material. And there are 8 hollows on the ceramic material, it means “full” in braille. When the blind man pouring the water to drink, they can put the fingers on the blind spot.If they feel the Convex point from the hollows, they can stop pouring the water.
Wu Chun Mao,
Tao Meng Yue,