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Euclid is assigned to SCPs whose behavior cannot be unerringly predicted, either because the item is sentient, it behaves outside of current scientific knowledge, or its nature is simply poorly understood at present. They require more diligence to keep contained than Safe-class objects. They may have unforeseen ramifications after their use due to their unpredictable nature. Some Euclid-class SCPs are eventually understood well enough to be reclassified as Safe, but most remain inscrutable even to the most rigorous of experimentation.