Re Flatland: <br>I think the 2D creatures, in their conception of the world, can be interpreted as non-sapient creatures or naive but intelligent pre-science creatures. The 3D creatures would be equivalent to humans able to perceive something beyond the "natural world" (the 2D plane), which is things like math/logic/science/philosophy -- immaterial, imperceptible things, but (arguably) still real. These 3D beings don't live in 3D space, as the 2D landscape represents actual, material reality. Rather, attaining sapience/intelligence or applying the correct Enlightenment methods has enabled these beings to grasp a new dimension, one of mind/reason, completely orthogonal to the physical plane. <br>And the 4D creature would be, at least from a 3D perspective, something beyond even rational understanding. True understanding, not merely intellectual acknowledgment like us performing n-dimensional math. I am talking about perceiving it as it truly, wholly is, like we can with 3D objects. And the 4D creature would obviously something metaphysical -- god.