“Cocoons made only of tape float in mid-air, capable supporting more than your average tree house.”

These terrifying structures are an art installation from Viennese/Croatian design collective For Use/Numen. The team uses nothing but packing tape to create huge, self-supporting cocoons that visitors could climb inside and explore.

Installed three times in the past year, the next deployment will be next week from June 9–13 at DMY Berlin’s International Design Fair, which is now in its 8th year.

The installations, which look like enormous alien arachnids came down to Earth to create portals into the lower dimensions of hell, were first deployed inside a small Croatian gallery, then an abandoned attic during October’s Vienna Design Week.

At the last installation inside Odeon, a former stock exchange building in Vienna, the group used nearly 117,000 feet and 100 pounds of tape. “The installation is based on an idea for a dance performance in which the form evolves from the movement of the dancers between the pillars,” explains For Use’s Christoph Katzler. “The dancers are stretching the tape while they move, so the resulting shape is a recording of the choreography.” Watch below to see how it was done.

The installation’s over-the-top theatricality comes easily to the collective, who design sets as well as furniture for the likes of Moroso and Element. In September, they’ll create a tape installation in a public space in the center of Frankfurt, and a five-star design hotel on the Croatian coast is forthcoming.