Optical illusions are exactly what they sound like, what you see is not what is really there! Your eye sees something and sends a picture to your brain which identifies what it thinks it is… but it might not be what was actually there in front of you. There are different types of optical illusion, including physiological, pathological and cognitive.
Optical illusions can be used for fun, magic shows, tricks, and in art… perhaps the most famous artist to use such illusions is Escher but other painters such as Bridget Riley, Salvador Dalí, Marcel Duchamp and Jasper Johns have also incorporated this technique into their work. Maurits Cornelis Escher was a Dutch artist who was born in Friesland ( a place I would love to visit) in 1898. he began by studying architecture, the influence of which is plain to see in his later work, and then what was called decorative arts. When he was twenty-four Escher went to Italy where he later got married and had a family. His art is puzzling and mesmerizing and appeals to a wide variety of people, whether they would consider themselves art lovers or not.
Sometimes just ordinary people taking photographs find that the result is an optical illusion – sometimes they are aware of it in the subject and it is why they took the photo, at other times it is just accident…
like me, when I looked at this picture it seemed skewiff, and I had to study it before I realised what was going on!
Lois Elsden 
How exciting!
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