Who is James Gibson from The Hidden Dimension and what is their importance?

Author of The Perception of the Visual World, James Gibson identified and classified sensory shifts and varieties of perspectives into four categories of perspective—position, parallax, independent of position or movement of observer, and depth at a contour. While these may initially be seen as relative only to the viewer of art, Gibson clearly expands this information to demonstrate that these perspectives relate directly to man's visual world and thus his spatial perceptions. Such perceptions provide the information all humans need in order to move about and engage in all life activities. Hall considers Gibson's system so important that he provides a comprehensive review of the system in the Appendix portion of his book.