This tattoo is fully animate within the confines of its host's skin and behaves largely as a normal animal would, albeit in only two dimensions. The tattoo's movement causes constant pain to its host, comparable and similar in character to simultaneous tattooing and tattoo removal on a large scale. The organism tends to spend most of its time on and near the torso. SCP-021 displays no intelligence beyond a basic pattern of feeding and locomotion, although actually measuring the intelligence of a two-dimensional life-form has proven impossible thus far.