FourSpace is a timeless mathematical void with four perpendicular spatial dimensions. Time is not an inherent consideration in
FourSpace. To a first approximation, we live in
ThreeSpace plus time, which is completely different. If an object moves around in
FourSpace, then all the sudden you're implying
FourSpace plus time. A slice of
FourSpace has a three-dimensional boundary. Two such slices may intersect at a plane, or be parallel, or you have
NonEuclideanGeometry.
Another conceptualization of 4-space (N-space) is
GeneralizedBalancedTernary.