Porcupine
The architecture is a single plane which is morphed to shelter inhabitable spaces. The side facing the exhibit entry resembles a sheet of graph paper from Phoebe's fieldbook, rigid and two-dimensional. A rip creates a portal into the three-dimensional world, opening a passage between the regular world into the "invisible" world. The underside of the plane is lined with fibers which can sense various fields, for instance attracting towards or repelling away from a magetic wand. By becoming the source, kids discover how they impact invisible fields.