Can you find the butterfly in the following image?
Click on the image to see the full-size version and then try looking 'through' the image by relaxing your eyes. With luck, you will see a green butterfly 'floating above the background. (I sometimes see a cluster of overlapping butterflies but the 'true' image is just a single butterfly.)
This is from a website about many fascinating optical illusions - see http://brainden.com/optical-illusions.htm If you are currently snowbound, spend some time tricking your brain with some of these extraordinary illusions
![Smile :)](./images/smilies/icon_smile.gif)
Mike