As you can see, I marked a few things on your photo. Referring to the pen mark, it gives the illusion to this particular section that it is split into five different sections. If it is just a pen mark, then its just three pieces of foam. Also, assuming that its a pen mark, that mark was used as a guideline to cut the foam off to make a bevel. And, I'm guessing you did a little sanding on the bevels?