optical illusions, Mixed reality, Pencil , artist, Ben Heine. 錯覺， 混合現實， 鉛筆， 藝術家Ben Heine。

Ben Heine: The incredible optical illusions created by artist's mix of pencil and camera | Mail Online
http://www.dailymail.co.uk/news/article-2041426/Ben-Heine-The-incredible-optical-illusions-created-artists-mix-pencil-camera.html