It used to be that hair pieces were called 'rugs.' And for good reason. They were thick and didn't show any scalp and it truly looked like a person had a 'rug' on their head. Showing scalp adds to the realism of a unit. Here's a photo of the top of Ruebin's head showing his Toplace unit. Notice how there is not a 'wall of hair.' Scalp is showing. Very realistic!