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http://brotherpeacemaker.wordpress.com/2008/03/28/beyond-our-shadows-of-doubt/

http://flickr.com/photos/misterrad/1605454714/

http://flickr.com/photos/pinksherbet/179279964/

http://www.foundshit.com/tag/optical/

http://flickr.com/photos/flashmonger/2842728671/

http://www.dphotojournal.com/daily-inspiration-playing-with-shadows/

http://flickr.com/photos/lumendipity/422278055/

http://paulison.com/photoblog/index.php?showimage=93

http://flickr.com/photos/8216432@N05/2049446691/

http://flickr.com/photos/miscellaneous/531864821/

http://snibbe.com/scott/body_image/shadow_bag/index.html

http://flickr.com/photos/hotair2112/137331615/

http://flickr.com/photos/jeffclow/705821061/

http://flickr.com/photos/antiguan/382737386/

http://www.photoflavor.com/index.php?id=477

http://flickr.com/photos/imago2007/2867852218/

http://flickr.com/photos/partyof5/147537202/

http://mclc.osu.edu/rc/pubs/lee.htm

http://flickr.com/photos/wan-der-lust/2295798346/