© 1962, Matthew Ngui, Documenta X
© 1992, Markus Raetz, Non Pipe
© 2011, Krystina Naylor, Open Box Series
© 2012, Marco Cianfanelli, Nelson Mandela Monument
I am not sure if I can explain why Optical Illusions are considered Art.
because Optical Illusions make us to look at things from different points of view.
They help us to discover something new, unexpected and most of the time beautiful things.