7/28    http://www.psy.ritsumei.ac.jp/~akitaoka/t2_03.jpg
        Optical illusion.
        \_ That is fucking trippy.
        \_ It's also worksafe.
           \_ I wouldn't have thought twice, but the comment made me question
              how safe it was. It's a bunch of abstract circles, so ya, it's
              WS.
        \_ some of the other ones at that site are pretty good too.  I like:
                http://www.psy.ritsumei.ac.jp/~akitaoka/sakuras2b.gif
                http://www.ritsumei.ac.jp/~akitaoka/wanage1.gif
                http://www.psy.ritsumei.ac.jp/~akitaoka/SwampA2.jpg