The book Rock Carvings in the Borderlands, published in cooperation with the Swedish National Heritage Board, says: “The images of trees in rock carvings illustrate that as early as the Bronze Age the southern Scandinavian region was part of a larger religious and cultural context that covered the whole of Europe and large parts of Asia.
وقد يساعد هذا الواقع ايضا على ايضاح السبب وراء تصوير اشجار تشبه الى حد بعيد الراتينجيّة الدائمة الخضرة على صخور في منطقتي بوهوسلان وأوستفولد قبل قرون من شيوعها هناك .‏