Magic cup / product

This kind of cup can turn color and shape,and used the meterial which can response stree and temperature in future.When put water into it,the cup began to become big for the influence of gravity,but when the water lessen,the cup’s volume also become smaller than before.If the water temperature is high,the cup will show red.However,once the water temperature with the limits of people can receive,it will turn green.Besides,when the amount of water gradually reduce,it show blue,and at final if no water in it,the cup will become white.What the design concept is that saving water for the green living.