An environmental piece of variable duration employing two groups of players interacting by means of visual »cues« from two sets of optical signals related, in real time, to the sounds of wind-modulated sound sculptures (aeolian harps). Such signals consist in a codified interpretation of optical kinetic patterns called »sound screens« by Peter Sedgley; they are autonomous, as far as their visual significance is concerned, but at the same time intimately connected with their parallel musical events, as a sort of optical-acoustic dialogue.