Is anyone else here able to visualize things in 4 dimensions? I have been able to as of a few years ago. I just started thinking really hard about the tesseract, and after a while it finally clicked. The key is to be able to visualize a 3d projection in its entirety, because a 3d projection is to 4d as a 2d projection is to 3d. Once I got it, I was absolutely mesmerized, lost in my thoughts for hours. Being able to think in 4d also helped tremendously with my intuition in higher dimensional math and physics. I highly recommend it.