It may be noted that artifacts, unless they are architectural ones, generally yield an optic array of limited scope. Only with a room can the complete spherical array of ambient be artificially structured. Artificial Causes of Optical Structure and Texture A. Method of Production 1. Pigment structuring . The depositing of pigments, dyes, ink, etc.
Examples are paintings, drawings, printing, pictures, transparencies.
Layout structuring . B. Intention of Producer 1. Portrayals of surrogates . Artifacts intended to yield a vicarious perception, i.e., to reproduce or represent, by displaying some of the same structures of light as would the original. Conventional non-portrayals .