Today you can figure out that someone is calling you on your mobile phone by the hearing the sound of your phone or feeling its vibrations. Thus you involve two senses: the auditory and tactile.Designer Sang-Hoon Lee decided to use light as the third way making it possible for you to understand that you're getting a call. As you can see from the images, when someone is calling, you can see it by the light that flows like water when your mobile phone is in the pocket.
The light also spreads when the phone is on the floor or table, thus you get a visual perception of calls.
