The Snaptun Stone is a historical artifact depicting Loki, the Norse trickster god. This stone was discovered on the western border between Norway and Sweden and was carved around the year 1000 AD. Notably, it portrays Loki with his lips pressed together, which is likely a reference to a story found in chapter 25 of the Prose Edda.
In this story, Loki makes a wager with the dwarf Brock and agrees that if he loses, Brock can have his head. When Loki inevitably loses the bet, Brock and the dwarves arrive to claim what was promised. Loki, being his usual lively self, declares that he is perfectly willing to give up his own head but insists that the dwarves cannot have any part of his neck. This statement leads to a debate about which part of the head constitutes the head, which is the neck, and which parts are in between. Unable to reach a unanimous agreement that satisfies everyone, Brock decides to let Loki keep both his head and neck. However, as a form of punishment for evading his debt through clever wordplay, Brock sews Loki's lips together.
The story of Loki's sewn lips gave rise to a rhetorical fallacy known as the "Loki wager." This fallacy involves making the unfounded claim that if a concept cannot be precisely defined, it cannot be discussed or considered. The fallacy can be countered by establishing a reasonable working definition of the concept in question.
The Snaptun Stone is currently on display in the "vǫlva cottage" as part of the permanent exhibition on the Viking Age at the Moesgaard Museum in Denmark. This artifact serves as a fascinating representation of Loki and his misadventures in Norse mythology.