In a 1915 newspaper article he stated that his aim at the time was to express "not what I see with my eye but with my consciousness . . . mental impressions, not mere literal matter-of-fact copying of line and form. I want to put the abstract into concrete terms."
I believe that the images and writing posted here fall under the "fair use" section of the U.S. copyright law http://www.copyright.gov/title17/92chap1.html#107, as they are intended for educational purposes and are not in a medium that is of commercial nature.