Mårten Andersson, who lived from 1934 to 2017, debuted in Stockholm at 23 years old and got off to a good start in his career. The exhibition was presented in 8 daily newspapers and the reviews were positive. At that time, the reviews could be much sharper than today, many debut shows were completely watched and the artists had a very hard time coming back. As a child, he received from his father a folder containing about ten works of art published by the Swedish Radio.

One of the pictures was Grünewald's "The Singing Tree", a painting that made a deep impression on him. His admiration for Grünewald has stood out over the years. He has also taken the impression of a branch of the naivistic art with L...