Bronze Age ritual cut into the rock at Högsbyn in western Sweden some 3000 years ago. Högsbyn is still a farming village close to lake and river systems connecting it to Lake Vänern and the west coast of Sweden.
A ship is presumably being carried or rolled on timber to be launched into the nearby lake, accompanied by horn blowers and acrobats in a festive ritual.
(In the later Viking era, ships were built during the winter and launched into the sea in the spring, so that´s what I think is depicted here)
Archeologists keep the carvings free from lichen and fill them up with red paint for visibility. This rural site is a popular tourist attraction in the summer.
See CALENDAR here