Ida Rolf the founder of Structural Integration also known as Rolfing used the grapefruit model to demonstrate to her students the divisions of fascia in the human body. In this video you can see how the grapefruit has an outer skin like we do. Below the outer skin is a white fibrous layer representing the deep fascia between our outer skin layer and the surface of our muscles. The segments of the grapefruit represent our muscles and the cells that make up each segment represent the smaller components that make up our muscles each of which is covered in fascia. Without the fascia our muscles would not have a structure. Our muscles are largely fluid. Later in this video we can actually see the fascia in the human body as Dr Jean-Claude Guimberteau a cosmetic surgeon uses an endoscope (camera) to show the fascia under the skin. You can see how fluid it is and how it responds to our movements, as well as to a therapists pressure when applying myofascial and KMI type techniques.