One logical extension of experimenting with transducers is building our own speakers. Paper speakers employ the same basic physics behind any electromagnetic audio speaker. In a paper speaker, the surface corresponds to cone of a traditional speaker. In an ordinary speaker, the magnet and coil are separate, but for paper speakers, everything lies on the same paper surface. Place it very close—or on—the surface of paper speaker circuit, turn up volume, and roam the surface to change the sound. Besides paper, other flat, flexible materials can make for good speakers as well. It can be difficult to know which circuits, which magnets, and which materials will work the way we want them to, and the only way to find out for sure is to try them out. But messing with paper speakers opens up all kinds of new avenues for discovery, not just for speaker building, but for ways of spatializing sound and integrating audio electronics into visual design.