No bent or diagonal lines; rows and columns all perfectly perpendicular. http://2.bp.blogspot.com/_SqhhJb_P3Kk/R3hXizzEMWI/AAAAAAAAACI/mf5nL9mi9Ro/s1600-h/bent+lines+illusion+trimmed.jpg
or, http://snipurl.com/n38s3
No bent or diagonal lines; rows and columns all perfectly perpendicular. http://2.bp.blogspot.com/_SqhhJb_P3Kk/R3hXizzEMWI/AAAAAAAAACI/mf5nL9mi9Ro/s1600-h/bent+lines+illusion+trimmed.jpg
or, http://snipurl.com/n38s3