Changes

That is, you have width and depth, but no height.

That is, you have width and depth, but no height.

So living on the surface of the balloon, you cannot see the shape of the balloon itself.

So living on the surface of the balloon, you cannot see the shape of the balloon itself.

If you went for a walk in a straight line, you would actually go around the balloon and end up where you started, despite not being aware that you were traveling in a circle.

If you went for a walk in a straight line, you would actually go around the balloon and end up where you started, despite not being aware that you were travelling in a circle.

The theory goes that the three dimensions of our universe that we can see are like the two dimensions of the surface of the balloon, which wraps around on itself in another dimension, so that if we traveled through space in a straight line, we would eventually return to our starting point.

The theory goes that the three dimensions of our universe that we can see are like the two dimensions of the surface of the balloon, which wraps around on itself in another dimension, so that if we travelled through space in a straight line, we would eventually return to our starting point.

One consequence of this idea is that the universe therefore has no edge (just like there is no edge to the surface of a balloon) and therefore no center.

One consequence of this idea is that the universe therefore has no edge (just like there is no edge to the surface of a balloon) and therefore no center.