Silhouettes. These show different peoples movements, however I don't feel that these are very helpful in understanding what the person is doing as they feel static (in one place). So I could incorporate movement lines or real people to make the movement more realistic.
Louis Kahn (from "Licht und Raum- light and space", Urs Büttiker) The chronological listing of projects traces Kahn's development process in light control and modulation. Projects beginning with student work from 1924 and ending with the Berkeley library from 1971-1974 reveal an extraordinary broad spectrum of solutions for the design of light and space. Kahn's struggle to find the coherent answer for each architectural challenge remains the basic principle characterizing his complete work.