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Each person may have another way to trigger an optical effect in this image. One way is to change the distance between the eyes and the image back and forth, while watching the centre of the image. Another way is to just watch the black colours in the image. Or to imagine that all red colours are running towards the red frame. You will also see an optical effect, if you would stare at the centre of the image and then move your eyes along the dark colourless rays which seperate the colourful parts, either horizontally, vertically or diagonally, while only indirectly observing the colourful rays. You could view all of my images with optical effects at : http://www.zazzle.com/mohsenart/gifts?cg=196904589798277291