Appendix
The argument of the book is here reduced to a working basis.
The Concept
The first point settled in the making of a picture after the subject has germinated, is the shape into which the items of the concept are to be edited; the second is the arrangement of those items within the proscribed limits; the third is the defining of the dark and light masses. This consideration forces the question whence the light, together with its answer, hence the shadow.