A very important kind of psychology experiments that play an important role in contemporary philosophical discussions of theory of perception.

http://www.youtube.com/watch?v=47LCLoidJh4&eurl=http://en.blog.buzzparadise.com/tag/change-blindness/&feature=player_embedded

i like this one more........  

http://www.youtube.com/watch?v=srzrfuw8QqM&feature=related

actually it's a different issue.......