After seeing images and the video from this Japanese trade show it looks like "digital paper" isn’t the only ultra-thin technology we have to look forward to. Japanese researchers have managed to create a prototype of a paper-thin speaker that not only has decent sound quality but also is capable of creating a virtual surround sound experience. The speaker is clear and flexible; in fact the posts securing it can be moved into different holes on the base to change the speaker shape right at the show. Is the future of multimedia technology one where we hold all of our gear in our wallets? Click through to watch the video.