Logo Physics (San Francisco)

San Francisco, CA. Does physics matter in logos? Maybe only to veterans of science museum work. Fed Ex Kinko's logo is a rearrangement of the original FedEx typographic colors. In the window of a printing service center, the three overlapping shapes seem to imply color primaries. Print primaries are magenta, cyan, and yellow, which would combine to make blackish in the center. But the logo uses light primaries—red, green and blue, which should combine to make white in the center, where it's dark blue.