Daniel Birnbaum introduces the first volume of Hilma af Klints Catalogue Raisonné – Spiritualistic Drawings (1889-1910).
The abstraction in Hilma af Klint’s pictures developed over time; it was a process in which a group of female friends, The Five, played a major role. The members of the group acted as mediums and deemed themselves receivers of messages from spirits regarding the development of humanity.