Wysips, the first transparent solar film, turns almost anything into a power source, without turning it ugly. The film’s thin strips of solar cells alternate with transparent areas. Lenses sit above the solar cells, hiding them from the viewer, while the transparent strips show what’s beneath the film. Wysips can be added during manufacturing to many materials, including glass, plastic and fabric. It will appear on a commercial cellphone screen next fall, powering 30 minutes of use from an hour of light, and should be on billboards by 2013.