Compás de agua is an essay on possibilities of modeling space from the water-light binomial. A virtual sculpture where water is explored as a specular surface. A kind of lens manufactured with musical instruments pieces and water. A drop of water continously bounced on the lens surface. The sound of the drop became more and more present and the directed light made visible the patterns that the waves repeat when the balance of the liquid is disturbed, creating a perceptual spectacle.