This installation is an interactive lighting sculpture made of concrete in the form of stalagmite or crystal. By the light stream which is coming from it, on the ceiling creates the effect of the water surface, which become dynamic by the presence of people next to the sculpture. Also there are a perforations on all surface of a sculpture which serially shine depending on the viewer's arrangement. So, it makes you feel that the light follows you. The used lighting effects have to create the atmosphere of tranquility and a pacification which will be perfectly suitable for study and rest.