Mathilda Nilsson was member of "Klöverbladet" and one of the founders of the Edelweiss Society in Stockholm, founded in December 1888.
The artists Hilma af Klint, Anna Cassel, Sigrid Hedman and Cornelia Cederberg (Mathilda Nilsson's sister) were the other four members.
Through their spiritual guidance, Cornelia Cederberg, Hilma af Klint and Anna Cassel was inspired to draw automatically in pencil, a technique that was not unusual at that time.
When the hand moved automatically, the conscious will did not direct the pattern that developed on the paper, and, in theory, the women thus became artistic tools for their spirit leaders.
In a series of sketchbooks, religious scenes and symbols were depicted in drawings made by the group collectively.