An animation based on geometric elements. Squares grow until the limit of the screen and retrocede, turning into moving rectangles. Each frame is followed by a negative of its image, what makes the light vibrates in a strobe effect, creating fast switches between full and empty, and bright-dark, interfering in the perception of the viewers. The sound is composed of two simultaneous microphonies, one sharp and constant, and the other grave and discontinuous.
