http://fr.wikipedia.org/wiki/Illusion_d'optique
http://www.scientificamerican.com/article/the-neuroscience-of-illusion/
http://www.bbc.com/future/bespoke/story/20150130-how-your-eyes-trick-your-mind/index.html
http://www.ted.com/talks/beau_lotto_optical_illusions_show_how_we_see?language=en
http://mesosyn.com/mental8-4.html
http://eaglemanlab.net/papers/Eagleman.NatureRevNeuro.Illusions.pdf
http://psychology.about.com/od/sensationandperception/ig/Optical-Illusions/The-Ponzo-Illusion.htm
http://www.quora.com/How-do-optical-illusions-work
http://hubpages.com/hub/Two-Faces-or-a-Vase-10-Simple-but-Wonderful-Optical-Illusions
http://www.livescience.com/43243-galileo-optical-illusion-explained-by-neuroscience.html
http://www.newworldencyclopedia.org/entry/Rubin_vase
http://hubpages.com/hub/Two-Faces-or-a-Vase-10-Simple-but-Wonderful-Optical-Illusions
http://www.weirdoptics.com/rubin-face-vase-illusion/
http://psychology.about.com/od/sensationandperception/ss/muller-lyer-illusion.htm
http://www.world-mysteries.com/illusions/sci_illusions3.htm
http://en.wikipedia.org/wiki/Penrose_stairs
http://www.youramazingbrain.org/supersenses/necker.htm#
http://www.newworldencyclopedia.org/entry/Kanizsa_triangle
http://eyediologyopticians.co.uk/pages/Optical-illusions.html
http://www.scientificamerican.com/article/the-neuroscience-of-illusion/
http://www.bbc.com/future/bespoke/story/20150130-how-your-eyes-trick-your-mind/index.html
http://www.ted.com/talks/beau_lotto_optical_illusions_show_how_we_see?language=en
http://mesosyn.com/mental8-4.html
http://eaglemanlab.net/papers/Eagleman.NatureRevNeuro.Illusions.pdf
http://psychology.about.com/od/sensationandperception/ig/Optical-Illusions/The-Ponzo-Illusion.htm
http://www.quora.com/How-do-optical-illusions-work
http://hubpages.com/hub/Two-Faces-or-a-Vase-10-Simple-but-Wonderful-Optical-Illusions
http://www.livescience.com/43243-galileo-optical-illusion-explained-by-neuroscience.html
http://www.newworldencyclopedia.org/entry/Rubin_vase
http://hubpages.com/hub/Two-Faces-or-a-Vase-10-Simple-but-Wonderful-Optical-Illusions
http://www.weirdoptics.com/rubin-face-vase-illusion/
http://psychology.about.com/od/sensationandperception/ss/muller-lyer-illusion.htm
http://www.world-mysteries.com/illusions/sci_illusions3.htm
http://en.wikipedia.org/wiki/Penrose_stairs
http://www.youramazingbrain.org/supersenses/necker.htm#
http://www.newworldencyclopedia.org/entry/Kanizsa_triangle
http://eyediologyopticians.co.uk/pages/Optical-illusions.html