I feel it sort of indent? It dosen't make any sort of noise but when I place my left palm on it I can't help but feel as if it bends in and touch something. Based on the rMBP construction its under the battery... so is it just because the casing is just expanding and such from heat/cool down. Again, its not going to warrant me exchanging this just wanted to know if there was an explanation for it. It only happens every now and then and it dosen't consistently happen when I place my palms there. This is my first time owning a Macbook with the aluminum enclosure. EDIT: It's as if when I place my palm there it creates sort of the same feeling you get from clicking on the trackpad it just dosen't make a large clicking noise nor dose it compress that far down into the body of the palm area.