The advent of spiritualist art-making in the 19th and early 20th century is emerging as an important addition to the art historical canon. For many years, the strange scribblings, obscure symmetries, figurative imaginings and floral bouquets transmitted from so-called other worlds, were overlooked - even ignored - by the cultural mainstream. In recent years there has been a significant shift. Exhibitions of Hilma af Klint and Emma Kunz at the Serpentine Galleries, and Georgiana Houghton at the Courtauld Institute of Art, have revealed the impact of Spiritualism far beyond Kazimir Malevich and Piet Mondrian.