Scandinavian rock art may in general be regarded as idealized depictions of a social world, not a direct description of concrete social matters. Even so, rock art does convey important social information that calls for more thorough comment. This study concerns almost 1700 ship depictions from western Sweden that include human representations. The average ship is depicted with a crew of six to thirteen individuals and these craft may have represented prevailing ideals about the crewing of ships. The large ship images with numerous crews in clearly defined positions may be depictions of war canoes, staged for special maritime events. The study shows that the visual proportions of the rock-art ships are similar to those of the prehistoric war canoe from Hjortspring, Denmark. It is argued that the praxis of pecking ships into the rocks could have served to manifest the agency of the maritime social world and, to some extent, to make this ideology more dominant.