Windows and doors

http://www.dpreview.com/challenges/Challenge.aspx?ID=1962&View=Results&Rows=4&Page=2

http://joanneberghold.com/gallery/?wppa-album=3&wppa-slide&wppa-occur=1

http://digital-photography-school.com/cats-in-windows-and-doors

http://121clicks.com/inspirations/25-amazing-examples-of-doors-windows-in-photography

http://lavenderdreamstoo.blogspot.com/2013/09/photography-challenge-windows-and-doors.html

http://www.hanselmannphotography.com/AllThumbPages/Hand%20of%20Man,%20Doors%20Windows.html

http://www.lynda.com/Photography-Portraits-tutorials/Working-window-light/115859/127748-4.html