Simplicity at his best: the hidden radio. The radio only has two functions: change the volume and tune to a radio station. When turned off we only see a lid. We have to lift the lid to turn up the volume, which is very intuitive, because we get to see more of the speaker as we lift the lid higher.
To tune the radio we only have to turn the lid. A LED will show the strength of the radio channel. What else do we need? And besides it is as beautiful as it is simple.: