I have the answer. I joined the forum precisely to answer this problem as I've been a proponent of revamping the system greatly ever since I joined OBD. Here's how I think we should imagine Multiverses, or spaces larger than Universes in general. Let's start with a basic example. Take 2 0-dimensional objects, points basically. It is easy to see that 2 points are separated by (or in this case, connected by) a straight line, a 1-dimensional structure. Now take two parallel lines, 1-dimensional structures. They are separated by a 2-D plane (or, more appropriately, lie on a 2-D plane) of whatever size. Take two 2-D planes/sheets, and they're separated by a 3-dimensional space/cuboid/whatever. and so on. You can extend this logic to any number of dimensions (in fact, we prove this in my Linear Algebra classes). Similarly, if we imagine a normal universe to be a 4-dimensional continuum (3 spatial dimensions and 1 temporal dimension), then 2 universes co-existing in a verse, would...