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SCP-173 "the Sculpture"; Euclid; Item SCP-173 is to be kept in a locked containment room at all times. When personnel must enter SCP-173's room, no fewer than 3 may enter at any time and the door is to be re-locked behind them. SCP-173 is a humanoid statue composed of rebar, concrete, and Krylon spray paint. It is immobile when directly observed, but it attacks people and breaks their neck when line of sight with it is broken. It is extremely fast, to the point where it can move multiple meters while the observer is blinking.