It seems to me that in order for him to actually see objects around him, the objects and his eyes would need to have some non-zero thickness in a third dimension. In Flatland, the inhabitants see each other as line segments, but isn't this really impossible? In order to see a line segment it must actually be other than a line segment. It must actually have a nonzero thickness in a perpendicular dimension. A true line segment would be invisible. Also, it seems a 1-D being would have to be other than 1-D in order to see. It seems he would have to be 3-D and his object would have to be 3-D. Ok, so what does this have to say about 3-D people viewing 3-D objects? Can the 2-D example be applied here or is this where it stops? If it stops, why is 3-D special? Do 3-D eyes and 3-D objects actually have to be 4-D in order for the eyes to see the objects?