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And my simple understanding of it is firstly that the expansion is not from one point, so you can't think of a small sphere getting larger and that by looking backwards in time we are looking towards the 'origin'/middle. The expansion of the universe is in every direction, not just one, so we haven't travelled 'out' from a centre point, but simply apart. The classic example is to draw points on an uninflated balloon and then blow it up. Considering only the surface of the balloon, the points are now all further apart than they were, but haven't moved from a common origin.
Although we can see more and more of the universe as time goes on (in absolute volume terms) due to the time from the universe changing from being opaque to transparent being further away from the time of observation (i.e. the present), we see proportionally less and less of it as (in relative volume terms), because due to the expansion less and less of the light from the rest of the universe can 'catch up' with us due to light having a finite speed.
Anyone feel free to correct me if my simple interpretation is wrong!
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