http://www-bcf.usc.edu/~kcoleman/Precedents/ALL%20PDFs/Aalto_ViipuriLibrary.pdf

-          Drawing of how skylights diffuse light (page 8)

-          Picture of rooftop and skylights (page 8)

-          Picture of skylights from the outside and the inside (page 8)

-          Drawing of the use of artificial light with the skylights (page 9)

“The artificial lighting followed the same principles of the daylighting. The light was designed to fall on the book diagonally and at all directions in order to avoid shadows. The placement of the fixtures were between the skylight openings. It is possible that Aalto was trying to mimic where the natural daylight came in, in order to achieve similar surroundings and environment when comparing the day to the evening.”