I'm at the flatland discussion (~45 mins)<br><br>They might cover this later<br><br>A 3D person sees 2D images, and must move around to infer the 3Dness<br><br>So a 2D person would only see 1D lines.  If they get yanked above their plane, they would still only see 1D lines.  It would take a lot of cross eyed determination to figure out what they are looking at<br><br>If they got special sensors that fed them 2D images (like our eyes), their minds still wouldn't be equipped to handle all that new data<br><br>To naturally grasp 4D, you would probably need to be born with a mind that's equipped to process 3D eyes (and exist in that 4D virtual world),(reply>), Huh