Before revision: Sciography, also spelled sciagraphy or skiagraphy (), is a branch of science of the perspective dealing with the projection of shadows, or delineation of an object in perspective with its gradations of light and shade.
After revision: Sciography, also spelled sciagraphy or skiagraphy (), is a branch of the science ofthe perspective dealing with the projection of shadows, or delineation of an object in perspective with its gradations of light and shade.