In the 1920s, Hilma af Klint spent extended periods in Dornach, Switzerland, where Rudolf Steiner had established an international centre for the Anthroposophical movement – the Goetheanum. At the Goetheanum, af Klint took part in the centre’s rich cultural life. Among other things, she studied Johann Wolfgang von Goethe’s theory of colours. In 1922, at the age of 60, she completely abandoned her geometrical way of working for the ‘wet on wet’ watercolour method that was inspired by Antroposophy and that Steiner and his circle had developed. An example of this is her series On the Viewing of Flowers and Trees from 1922. Most of the series presented in this, the sixth volume of Hilma af Klint’s catalogue raisonné, have no titles.