The minute variations in thickness highlight the veins of the marble. The light penetrates the thinner and thicker areas to different degrees, emphasising the transparency and opaqueness of the material. The asymmetrical shape of the Pura bowl is a result of the balance of solids and voids and leads it to rest naturally on just one side. The marble is processed using numerically controlled machinery and then smoothed by hand to give it a semi-polished finish that preserves its natural appearance. On the underside of the Pura bowl a circular brass plate with Ruthenium finish is engraved with the signature of the designer and the Poltrona Frau logo.