I couldn't think of an artist, off the top of my head, whose name; first or last, starts with X. So I did a google search and came up with an artist I'd never heard of before. Thanks ABC Wednesday! And what a bunch of nice people they are!
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.