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The thicknesses of the bottom of the cup are not the same on both sides,
exposed to different air temperatures, thin side of the ice will melt floating
earlier, thick side will be later, and the
ice will flip floating to the surface.
Bottom of the cup is an ice box, modeling a variety of changes, such as shark fins, frog..., after pouring water, and place in a freezer into ice.
When you need a drink, get the bottom of the cup from the freezer, insert to cup body, it becomes a complete cup.
Slowly pour a drink, liquor or water, there will be no ice on the surface.
Minutes later the ice melts, the ice will flip floatingto the surface.
Chiayi City, Taiwan