The Swedish artist Anna Cassel (1860–1937) had left a relatively modest mark on art history until now.
 Her art is dominated by sweeping landscapes and cityscapes with motifs from the  Swedish rural counties Jämtland and Västmanland, and from Stockholm.  Cassel was also a close friend of Hilma af Klint’s. They collaborated both spiritually and artistically and were members of the Christian spiritualist group The Five, founded by Sigrid Hedman (1855–1922)  and active from 1897 to 1907.  Almost a century after her death, for the first time, The Saga of the  Rose presents many of Cassel's occult and spiritual paintings. In two essays, Cassel is introduced to a wider audience, and it is clear that the collaboration between her and Hilma af Klint was much deeper than previously known.