It's not often we see concepts based on peas, but there's a first time for everything. Designer Lu Le has borrowed the idea of a pea-pod for this wireless "dynamic audio environment" Pea Speaker system: seven Bluetooth-enabled speaker spheres, that can be distributed around a room for unusual stereo separation.
It's not envisaged as a surround sound system, apparently, but rather as a way to more completely fill an area with sound. I can't imagine it would be too difficult to engineer it as a portable, ad hoc surround setup, though.
Recharging of the individual spheres would be done through induction when in the 'pod' holder, which is based on existing technology. In fact the whole thing could be produced right now, which is something of a surprise for a concept design.