GERTY has a white colored cube-like body, inwhich in that body, there is a shown set-piece with a light coming out of it. This is GERTY's main eye. There is also a tiny screen near the bottom left, where he can display things, but it mostly desplays different emoticons, showing GERTY's current mood, he also has a robotic arm on the body, which help him grab stuff. GERTY's primary function is to protect sam, and the other astronauts that would come after him, GERTY is also Psychologicst/Therapist