Object Class: Euclid
Description: Origin is as of yet unknown. It is constructed from concrete and rebar with traces of Krylon brand spray paint. SCP-173 is animate and extremely hostile. The object cannot move while within a direct line of sight. Line of sight must not be broken at any time with SCP-173. Personnel assigned to enter container are instructed to alert one another before blinking.

CC-BY-SA 4.0 Eduardo Valdés-Hevia
Image sources: Zhuo Cheng you, Grendelkhan, Downtowngal, takomabibelot, Ben Schumin, Mike Linksvayer

My redesign for the very first SCP, 173. As the original image is removed from the article, this is my way of honoring it and all the stories it has spawned!

More SCP artwork.