When I criticize this episode as preposterous, what I refer to is the absurdity of the alien being two-dimensional. In the episode, the Optometrist tries to explain the principle by using a sheet of paper, saying that when the alien shows only the SIDE of his body that it becomes "invisible." That comparison between the alien and a sheet of paper does not make sense at all, because if you look at the EDGE of a sheet of paper, it STILL has a thickness, a depth. So the idea that an object can be Two-dimensional makes no sense at all. In order for any object to have substance, it has to have THREE dimensions.
Please read the following before uploading
Do not upload anything which you do not own or are fully licensed to upload. The images should not contain any sexually explicit content, race hatred material or other offensive symbols or images. Remember: Abuse of the TV.com image system may result in you being banned from uploading images or from the entire site – so, play nice and respect the rules!