European design collective Numen has been working at the boundaries of spatial and industrial design for more 15 years. They've constructed enormous web structures, as if conceived by a giant spider, and wombs built from carpet. Their newest work was a prototype developed in Vienna that's an adaptation of those ropey play structures you might remember as a child.
On the exterior, String Prototype appears to be a giant inflatable dome, but on the inside, dozens of ropes keep viewers/players aloft. Numen says the end effect is "impossibility of perception of scale and direction results in simultaneous feeling of immenseness and absence of space."