These two mathematical sculptures by Morton C. Bradley are 16″ and 20″ in diameter, respectively, made from 2-ply Strathmore paper. The geometric forms are each based on twelve copies of a Kepler-Poinsot polyhedron, with twelve great dodecahedra on the left and twelve small stellated dodecahedra on the right. If you want to try putting together your own paper models, all you really need to know is that, in each case, the visible facets are isosceles triangles in which the ratio of one edge length to the other is 1.618. In the form below-left, each triangle has two equal short edges and one longer edge; at right, they have two equal longer edges and one short edge.

An ark-shaped pavilion built from 1.5 million recyclable plastic PET bottles has already taken shape in Taipei.  Hailed as ‘the world’s lightest, movable, breathable environmental miracle’, the EcoARK pavilion is a 130-meter, nine-story pavilion that endorses the concept of environmental conservation.
The POLLI-BRICKS, which is made of 100% recycled PET polymer quarried from the waste stream. POLLI-BRICKS significantly reduces the cost of constructing interiors and exteriors of buildings. Once these buildings are completed, operating costs drop dramatically.