The two figures of the ventilation towers play with subtle ondulations and move closer to the shapes of abstract sculpture.Due to their imaginative design, the ventilation towers haven“t escaped diverse metaphorical interpretations.Some consider them as an anticipation of the surrealist movement for the use of smooth forms that evoke oneric images.Other theories maintain that one of the two towers is a mask or monstruos face with various eyes maybe inspired by the cubist images of Picasso.The one here is 5,60 mts. high.