Círculo y cuadrado (Circle and square): this is a Vasarely's aesthetics exploration work. Victor Vasarely, with his Op-Art, generated movement and volume illusions from simple bidimensional figures like the circle and square. This art video deals with said ideas, adding the temporal dimension of music (electro-acoustic, in this case). As in previous works, software was specially designed for achieving the combination of image and sound; in this particular case, all the base images were generated by computers with their own algorithms.