This is a torture device used during the Spanish Inquisition. I came across it while touring a museum in Granada entirely dedicated to the Spanish Inquisition. Supposedly this specific device was really used during the Inquisition but I have no way to verify that. According to the museum: “Interrogation Chair: The colossal amount of spikes, more than a thousand, made this an essential instrument of the torture chamber to instill fear in the prisoner. The accused was seated naked and the pain would increase by hitting them or by pushing the various parts of the body against the spikes. Sometimes the seat was made of iron so that it could be heated from below.” But if you think this is bad I have pictures of instruments that make this look tame and will make your skin crawl.