http://www.sciencedirect.com/science/article/pii/S0042698908002800
https://books.google.co.uk/books?id=LNnSBQAAQBAJ&pg=PA487&lpg=PA487&dq=optical+illusions+symmetry&source=bl&ots=xFRg4LWb4I&sig=6QtJF17jKC3Qf_xok0RtjKHuAy4&hl=en&sa=X&ved=0ahUKEwi-64H08LDSAhXkL8AKHddhBBI4ChDoAQhAMAU#v=onepage&q=optical%20illusions%20symmetry&f=false
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