― Denise A, Wednesday, 21 January 2004 18:44 (twenty-two years ago)
― Lynskey (Lynskey), Wednesday, 21 January 2004 18:49 (twenty-two years ago)
― andy, Wednesday, 21 January 2004 18:50 (twenty-two years ago)
Like the rabbit-duck image here?
http://mathworld.wolfram.com/gifs/rabbduck.gif
I don't know any real name for these illusions, but I know the famous old-woman/young-woman picture (woodcut?) is called a Boring figure.
― Maya, Wednesday, 21 January 2004 19:33 (twenty-two years ago)
― Casuistry (Chris P), Wednesday, 21 January 2004 19:39 (twenty-two years ago)
― Sean Carruthers (SeanC), Wednesday, 21 January 2004 19:42 (twenty-two years ago)
― Alex in NYC (vassifer), Wednesday, 21 January 2004 20:40 (twenty-two years ago)
http://www.coolopticalillusions.com/illusions/manwoman.gif
At least one of them's a bit rub though.
― N. (nickdastoor), Wednesday, 21 January 2004 23:44 (twenty-two years ago)
― dean! (deangulberry), Wednesday, 21 January 2004 23:46 (twenty-two years ago)
― Spencer Chow (spencermfi), Wednesday, 21 January 2004 23:46 (twenty-two years ago)
Diptych.
― dean! (deangulberry), Wednesday, 21 January 2004 23:47 (twenty-two years ago)
― dean! (deangulberry), Wednesday, 21 January 2004 23:48 (twenty-two years ago)
― dean! (deangulberry), Wednesday, 21 January 2004 23:49 (twenty-two years ago)
http://www.coolopticalillusions.com/illusions/rabbitduck2.gif
― N. (nickdastoor), Wednesday, 21 January 2004 23:54 (twenty-two years ago)
― N. (nickdastoor), Wednesday, 21 January 2004 23:57 (twenty-two years ago)
― N. (nickdastoor), Thursday, 22 January 2004 00:04 (twenty-two years ago)
― teeny (teeny), Thursday, 22 January 2004 00:05 (twenty-two years ago)
― teeny (teeny), Thursday, 22 January 2004 00:07 (twenty-two years ago)
― teeny (teeny), Thursday, 22 January 2004 00:08 (twenty-two years ago)
― teeny (teeny), Thursday, 22 January 2004 00:10 (twenty-two years ago)
― N. (nickdastoor), Thursday, 22 January 2004 00:13 (twenty-two years ago)
(I don't get the one with the fox. I don't see any horse, any lambs, any bats...)
― Pleasant Plains (Pleasant Plains), Thursday, 22 January 2004 00:16 (twenty-two years ago)
― teeny (teeny), Thursday, 22 January 2004 00:22 (twenty-two years ago)
― teeny (teeny), Wednesday, 11 February 2004 18:46 (twenty-two years ago)
― teeny (teeny), Wednesday, 11 February 2004 18:48 (twenty-two years ago)
― nickalicious (nickalicious), Wednesday, 11 February 2004 18:58 (twenty-two years ago)
― mark p (Mark P), Wednesday, 11 February 2004 18:58 (twenty-two years ago)