These vases are made of marble and were created by using waterjets. They were designed by Paolo Ulian & Moreno Ratti, and each made from a single marble tile. See more at Contemporist.
With waterjet cutting the tile is divided into four equal pieces of cm. 20x20x3 and from each of these concentric rings are formed with a very thin thickness, about 4 mm which, superimposed and rotated among themselves, go to make the shapes of the four vases.