There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime to change.— Edward Witten
Glamorous Spacetime quotations
Spacetime tells matter how to move; matter tells spacetime how to curve.
What lies north of the North Pole?
It is theoretically possible to warp spacetime itself, so you're not actually moving faster than the speed of light, but it's actually space that's moving.
On the other hand, we don't understand the theory too completely, and because of this fuzziness of spacetime, the very concept of spacetime and spacetime dimensions isn't precisely defined.
It is scandalous the way some scientists accept uncritically some of the most ridiculous speculations, such as the plurality of worlds, the opinion that spacetime has more than 4 dimensions, that particles can move faster than light, or that human life can be prolonged indefinitely.
Asking about a time before the beginning of our spherical spacetime is like asking what lies north of the North Pole. There is no such thing.
In the popular imagination, the Big Bang is a great explosion;
at one time there was nothing, then matter erupted into previously empty space. However, the Big Bang is the beginning of spacetime itself, not an event in time.
Every artist's strictly illimitable country is himself.
An artist who plays that country false has committed suicide; and even a good lawyer cannot kill the dead. But a human being who's true to himself - whoever himself may be - is immortal; and all the atomic bombs of all the antiartists in spacetime will never civilize immortality.
So: if you buy the notion that reality consists of the things in your freeze-frame mental image right now, and if you agree that your now is no more valid than the now of someone located far away in space who can move freely, then reality encompasses all of the events in spacetime.
Like any place in Reality, the Street is subject to development.
Developers can build their own small streets feeding off of the main one. They can build buildings, parks, signs, as well as things that do not exist in Reality, such as vast hovering overhead light shows and special neighborhoods where the rules of three-dimensional spacetime are ignored.
Contract law is essentially a defensive scorched-earth battleground where the constant question is, "if my business partner was possessed by a brain-eating monster from beyond spacetime tomorrow, what is the worst thing they could do to me?"