This top was seamed actually...it's nearly 14 feet long, so far too large to make out of a single piece of granite. We typically like to seam things at a location that works with the vertical lines of the cabinets, so it looks purposeful...sometimes that's in the middle and sometimes it's not. A lot will depend on the type of granite that you choose. Some will have patterns and movement that will not seam well, so you want to hid the seam as best you can. Others, such as this granite, will seam very well and if you have a really good installer, you will be hard-pressed to ever see it.