Björn Ahlgrensson began his career as a student at the Konstnärsförbundet (Artists Association) school, where he studied decorative painting. Gustaf Fjaestad urged Ahlgrensson to move to Arvika and join the Rackstad Colony. Members of this colony dedicated themselves to painting, ceramics, music, cabinet-making and similar pursuits. Ahlgrensson’s painting was inspired by literature and music with clear associations to nineteenth century Swedish nationalistic romantic longing and melancholy landscape paintings. The artist also painted portraits. Ahlgrensson’s work is represented at Nationalmuseum in Stockholm.