LEGO optical illusions

Loking at this board, it is hard to believe your own eyes, but all the lines are straight! They appear to be curved but they are not.

Impossible bench

Escher's "Relativity"
details and bigger image, click here: http://www.andrewlipson.com/escher/relativity.html

Escher's "Balcony"
For details and enlarged pic click here: http://www.andrewlipson.com/escher/balcony.html

Escher's Waterfall
For larger image click here: http://www.andrewlipson.com/escher/waterfall.html

Impossible Arch

(via: http://richardwiseman.wordpress.com/2011/03/03/best-ever-lego-illusions/)

More optical illusions made in LEGO can be seen at Andrew Lipson's web site. Ckick here: http://www.andrewlipson.com/lego.htm