The first part of the movie, in black and white, pans vertically through a 3-D computerized reconstruction of a skin-cell slice. The cell's nucleus appears at the top right, and the membrane enclosing the cell--complete with Velcro-like cadherin proteins for attaching to other cells--cuts through the lower-left quadrant. The second part of the movie displays a color-coded 3-D representation of the same cell. Cadherin proteins are shown in brown, and the nucleus is shown in blue.