Sender: dntx Winter Bird Listens to the Snow, message area: ASCIIArt Title: Coffee Wall Illusion Improved Version Sending station: BBS Westward Journey Station Fri Apr 5 19:32:49 2002 The coffee wall illusion is named after a 19th-century café in the English city of Bristol that had tiles like this on its walls The tilt of the horizontal lines in the coffee wall illusion is caused by simple direction-sensitive cells in the visual cortex Each tilt component combines to result in an overall tilt in the perception of the horizontal line. Interactions between cells explain how a continuous straight line on the retina tilts in the direction of a diagonal bar Detailed information can be found at the following URL http: www.xinli.net qq illusion class cafe wall.html Source: Sun and Moon Guanghua bbs.fudan.edu.cn [FROM: 10.83.2.50]