In prisons we find places with out so many light or ventilation. These have almost no chance of receiving natural light and air due to security concerns. It is a great challenge for us to achieve good natural lighting in these interiors due to the impossibility of using openings. The "tubes" are made to direct Natural light and to ventilate through cross ventilation. At certain times of the day, light rays collide with the prism who produces various colors inside the cell, giving them a light of hope inside the prison.