This paper describes the principles of traditional pen-and-ink illustration, and shows how a great number of them can be implemented as part of an automated rendering system. It introduces "stroke textures," which can be used for achieving both texture and tone with line drawing. Stroke textures also allow resolution-dependent rendering, in which the choice of strokes used in an illustration is appropriately tied to the resolution of the target medium. We demonstrate these techniques using complex architectural models, including Frank Lloyd Wright's "Robie House." CR Categories and Subject Descriptors: I.3.3 [Computer Graphics]: Picture/Image Generation; I.3.5 [Computer Graphics]: ThreeDimensional Graphics and Realism -- Color, Shading, Shadowing, and Texture. Additional Key Words: architectural rendering, comprehensible rendering, non-photorealistic rendering, prioritized stroke textures, resolution-dependent rendering, texture indication.