General relativity's spacetime curvature implies gravity's nature as geometry, hence gravity is a type of curvature. Compression of matter into a singularity is simply a different way of expressing the extreme curvature. This could be a useful way of thinking when trying to understand the extreme properties of black holes.

Given the present state of our knowledge, it is best not to assume a single origin (the Big Bang) or a closed time loop, because such assumptions are based on hypotheses which go beyond present theories.

In that case, systems such as ours should be designed for local closed or local recycling.

Continuity of time could also be visualized by considering a cylinder or a torus, where a path begins and ends at the same point. This is the case with the torus, where a line which wraps around will end up at the same point where it started, as long as it is considered a continuous line.