I love this ultimate 'anti-bling' impractical yet unique design that offers an quirky alternative to the traditional analog or digital radio mechanisms. You do use rocks, but not the expensive kind. The Natural Radio concept by Cheol-Ki Jo uses a scale instead of dials or buttons. You control the radio organically by placing stones on either sides of the scale. At least it will be a motivation for you to not increase the volume too much, think of the rocks you will need to use!