Koski, who lives in a farm near Vaasa, on the west coast of Finland, uses only organic rye from her own field to make her himmelis. She selects and hand cuts her own rye straws. Even though himmelis seem quite geometrical and architectural, many designers consider the himmeli more of a sculpture than an ornament. As a full-time himmelist, she travels round the world teaching courses, she has shown her work in innumerable exhibitions and her first book, Himmeli, is in its fifth printing. Her books are published in five languages.