Cero Outdoor Stool by Serralunga. Cero stools are informal seats made of polyethylene, characterized by lightness and defined by their open shape. The fascinating combination of shape and function makes it a sculptural element of contemporary furniture, ideal for decorating a contemporary urban environment with style and vitality. Ideal for home decor and outdoor living, it is easy to move and can also be used as a footrest or as a decorative element. Cero Outdoor Stool by Serralunga is designed by Brian Steendyk.