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 science of the perspective dealing with the projection of shadows, or delineation of an object in perspective with its gradations of light and shade.