This is a new design of tea cup and filter, it is made by designer Vuk Dragovic.
The teacup is made up of two hemispheres. Between the hemispheres is a thin net which prevents the tea leaves from entering the cup. While the aroma from the tea leaves is mixed with hot water, the cup is covered with the top hemisphere, preventing the aroma from evaporating into the air.
After 3 minutes, when the tea leaves have released their flavor, the tea cup is ready to be flipped 180 degrees and the leaves will be separated from the tea. All that is needed is one hand movement in order for the leaves to be separated from the liquid, in other words, for the tea to enter into one hemisphere from the other without spilling.
This is quite creative as drinking tea is traditional thing, Vuk is bringing a new dimension to it. Although I think that using the normal method would be more convenient and easier, but why not try something new.