A large orange tent, made of micro-perforated plastic and therefore partially transparent, with four vertical walls and a large concave veil as a ceiling, which from a height of 2.40 meters from the four corners reaches the ground in the center.
One enters it from one corner, bathed in orange light, walks along the inner edges or can crawl under the perfectly spherical belly. On the edge opposite the entrance, a small ladder, through a hole in the sheet, leads to the surface, there where the canopy rises: from here it is possible to slide down, toward the bottom.
Those who have stayed below will see dark shadows moving and crawling.