The blue elements in the image above appear to be a arranged in a continuous spiral, but in fact they form a series of concentric circles. Your brain will argue so strongly for a spiral that you may need to run your mouse cursor around the circles a few times to convince yourself.
Image credit to Akiyoshi Kitaoka 2009. Via Moillusions.
If we want creators to continue to make images such as this, perhaps we should get more serious about protecting their ability to maintain a revenue stream.
Lets grow up journalists - check your sources and give credit where it's due.
http://www.psy.ritsumei.ac.jp/~akitaoka/uzu7e.html