This proyect is both a watch tower and a dweling. The tower has an external structure and an internal helical stair. The external structure is peculiar because of the lack of vertical lines. The máximum slope is 90% so that the structure gains the strength due to its own intersections. The interior is adecuated for a surveillance space. It consists on a unique stair which turns into three longitude platforms. The platforms are 0.8 meters wide and 4.5 metres long. The furniture is adaptated to the longitudinal condition of these platforms so they are dinamic pieces but no wider than 0.8 metres each. The tower decreases its density structure as it gains height in order to be stronger and more private in the lower levels but on the other hand it is more opened ont the higher levels. This tower measures 18 metres height.