About Beer Pad
Put Your mug of beer on circle displayed on screen and look how light fills your glass!
You can change color and animation of light to make different effect.
The best effect you can gain with max screen brightness and in dark room. Another thing that affect the effect quality is screen type (the best type for this application is AMOLED)
WARNING!
Be carefull when you put mug on screen of your device. Most of phones have fragile screens and they are not resistance for fluids!