Black Elements by Bertil Vallien, Kosta Boda. Black Elements is a series of handmade sculptures with the famous hand-painted glass head cast in solid glass blocks. A beautiful sculpture with a face. Faces have always been a symbol of Bertil Vallien and are found in almost all artworks by Bertil Vallein. In the values of Black Elements, we meet the clear glass in stark contrast to the opaque black glass.