PLEASE TAKE A MINUTE AND CHECK OUT THESE SHIRTS.
An easy to (do it your self illusion) FOR MORE VISIT SOURCE http://www.braingle.com/brainteasers/optical-illusions.php WHERE I FOUND IT.
i used plain drawing paper. not copy paper. and black pastel chalk and some old masking tape (the not too sticky kind) so it would peel off easy without tearing the paper.