For Sylvain Willenz, the design of the SILEX vases was an important study in form. When you look at the vases from above, they are not really cylinders, nor are they squares. The faceted corners are in stark contrast to the curves of the glass. Not an easy shape to make in glass, says Willenz. It takes a lot of lung power to get the sufficient amount of glass up against those faceted corners. This is an additional difficulty you don’t face with round shapes. Another challenge is the weight of the SILEX vases. This weight requires strong, experienced and specialised glass blowers who can deliver the vases in the right shape. The two colours, amber and smoky blue, complement each other perfectly. Refraction of light ensures that each vase looks different from every angle.