A team of industrial designers from the Croatian/Austrian studio Numen/For Use has unveiled “the String Prototype”, a massive, inflatable cube whose interior of intertwining strings serves as a jungle gym for kids and adults alike. It looks awesome. At the bottom of the structures is an air cushioned that will protect falling climbers. Unfortunately, it could be a while before you can experience the String Prototype for yourself, as the group is still finishing the development stage of the project …