1. A multi-projection system, comprising: a plurality of projectors for projecting images onto a plurality of projection surfaces, wherein at least some of the projection surfaces are not parallel to each other, wherein the projection surfaces are composed of at least a screen surface in a theater and at least one other surface in the theater which is made of a different material from the screen surface, wherein images projected onto said at least one other surface are corrected based on properties of the material of said other surface to create images that are more harmonious with those images being projected on the screen surface, and wherein images projected onto said at least one other surface are complimentary images to those images being projected onto the screen surface so as to create a total image which provides three-dimensional effects by projecting different images onto the plurality of projection surfaces.