At this time he and Otto discovered the philosophical works of Arthur Schopenhauer .
Motivated by Kessler 's support and admiration , and introduction to the cultural life of Frankfurt , the ' Frankfurter Years ' were the most artistically productive for Busch .
At this time Busch and Otto discovered the philosophical works of Arthur Schopenhauer .
Motivated by Kessler 's support and admiration , and introduction to the cultural life of Frankfurt , the ' Frankfurter Years ' were the most artistically productive for Busch .