Although the terms are often used interchangeably, they are not identical. Perceptions are based on point of view. This fact is acknowledged in the art of the cubists. It is the basis of motion picture production. It is essential to understanding how collections of images acquire meaning.
Collections are the basis of systematic observation.
How one arranges and describes objects in a collection defines the scheme of knowledge. There can be more than one single scheme of knowledge. Like the view through the kaleidoscope, the same collection of objects or images may be rearranged to create a different order. For example, natural history classification has changed radically with the introduction of cladistics. Classification schemes were an integral part of American International Expositions in the late nineteenth and early twentieth centuries.