착시

 

 

 

 

 

 

착시 1

 

http://blog.naver.com/jeehaun2002?Redirect=Log&logNo=110074196327

 

 

착시 2

 

http://blog.naver.com/huehmc?Redirect=Log&logNo=70126520545

 

 

escher

 

http://image.search.naver.com/search.naver?sm=tab_hty.top&where=image&ie=utf8&query=%EC%97%90%EC%85%94&x=0&y=0

위키피디어

http://en.wikipedia.org/wiki/Ambiguous_image