Alec Soth also feels frustrated sometimes, and also seems to questions the medium, and also resorts to self-imposed assignments such as this one ~

check it out ~

http://6thfloor.blogs.nytimes.com/2011/09/23/how-to-restage-an-iconic-photograph/

and ---->

http://www.nytimes.com/interactive/2011/01/23/magazine/rockford.html

cheers ~