A one module shelter is made from 99 carton tubes tied together. The tubes are made from recycled paper, and are recyclable when worn out from building and rebuilding. Canvas covers the shelters and is reusable and durable, and there are small windows to allow air circulation to renew the interior environment. A ready-made chimney at the top provides the necessary circulation. The windows are cut during construction and the resulting pieces of tube can be used to close or open them, depending on their orientation. Foundations can be made from cement mixed with debris that is abundant in crisis situations. For improved physical and thermal resistance the tubes can be filled with earth or sand and the tops sealed with plastic covers, or they can be left empty for quick construction. If atmospheric conditions are bad the walls can be given an exterior insulation of tar or clay or the tubes can be manufactured with a water resistant additive.
Construction of one module begins by clearing a circular area of about 6m in diameter. Then a circle with a radius of 2,8m and a straight line passing through its center are traced on the ground. The first two pilars are erected at the points where the line intercepts the circle. The other four pilars' locations are determined by the intersection between the existant circle and two additional circles with 2,8m of radius centered around the two previous pilars. After this, six more vertical tubes are added excentrically 15cm away from the first ones. Tubes are then stacked between these two sets of pilars to form the walls. Finally the whole structure is covered with canvas.