BV Drifter AC-20 from Kosta Boda Artist Collection is infused with simplicity and space, with a copper figure sealed inside the ship by Bertil Vallien. Drifter from Kosta Boda Artist Collection is infused with simplicity and space, with a copper figure sealed inside the ship by Bertil Vallien. The object in clear glass is cast in a graphite mold at Kosta Glassworks, with a base that allows it to stand stably without a platform.