Though Sans is usually agreeable, he becomes eerily serious at particular moments. Conversely, he suggests that this knowledge could be 'a poor excuse for being lazy.' He wonders if his indolence stems from his knowledge that any progress he makes will be erased when the timeline resets. His laziness is a combination of fatalism and apathy. Sans is laid-back and flippant, often sleeping on the job and taking breaks. (however he does grimace/frown upon being hit in the Genocide Route and is shown sometimes frowning in Fan-art) When Sans uses telekinesis, his left eye flashes light blue and yellow, the colors for Patience and Justice, and his right pupil disappears. He wears an unzipped blue hoodie, a white top, black shorts with white lining, and a pair of salmon-colored slippers. He has white pupils that disappear when he is serious or angered. Sans appears as a short, paunchy skeleton with a wide toothy smirk, large eye sockets.