Perhaps the table is expandable, and that is the center insert (the other seam could be covered by figures).
Edit: Doesn't look like it, actually...
Actually, if you look at the largest image you can see that the middle pile of red figures is on top of a seam that is equidistant from the table seam. I thought I was the only person who would have noticed that. I am happy that I am not.
Ah, what some of you have rightly noticed is that the table has three parts. There is a small middle part, and two "wings", which fold down, making in very easy to stow away the table when you need space. However, the second seam is covered by Saruman's reserves (you can see this on the full-sized photo). So, yes, total OCD in progress! Perfectly centered!
