The unique hourglass shape of the Swisspearl Spindel Pot points to the mid-century period in which it was created. Designed by celebrated Swiss industrial designer Willy Guhl, these planters offer an exotic element to a rooftop garden, terrace or courtyard. Based in Switzerland, Swisspearl is a company who has been specialising in cement products since 1903. Their products are made from a blend of cement, powdered limestone, cellulose and synthetic fibres, water and air. The result is the look of real poured concrete but at a fraction of the weight.