I am not sure if this is caused by the heat that some how curve the body a bit. All you do is lift the MacBook Pro and view at the keyboard 30 degree angle. Look above the keyboard where the hinge is. The part looks curvy start right off between key F2 to F6. That is also where the CPU and GPU is. The hot spot. Also if you look at the other/opposite side of the Sleep indicator or IF infrared. That part is also curved up a bit. I mean this is metal (aluminum)... not plastic.. Illusion? I'll let it cool later to see if it goes back into normal flat line.