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The problem which the blind encounter most frequently is that they just do not know how much water they pour into the cup. In that case, they are easy
to make the water overflowed and sometimes even burn themselves. As we
know, the blind often reach into the cup to know the water level.
BULGE CUP is a design which aims at making the blind pour water into the
cup more convenient. The cup is designed to have three rubber rings,when the water reaches the location of one of these rings, the water pressure led the ring to protruding outward . The blind touch the projection by fingers so that they will be able to get to know the water level.