From a M.C.Escher letter:
Baarn, 20 April 1969:
"The Hippies of San Francisco continue to print my work illegaly. I received some of the grisly results through a friendly costumer over there.Among other things, such as virulently colored posters, I was sent a forty-eight-page programme or catalogue of the so-called "Midpeninsula Free University", Menlo Park, California. It included three reproductions of my prints alternating with photographs of seductive naked girls."
You are free to download, copy, disassemble, manipulate, the"QuickTime Virtual Reality" files of these Optical_vr pages, I 'll be glad if you send me a copy or a link to your works .
Antonio Garbasso, Roma 2001