The Contrast Optical Illusion
A while back Richard Wiseman posted an excellent optical illusion on his blog here. It looks like a green, blue and pink stripy spiral when in fact it is a turquoise, purple and orange spiral. The difference in purple and orange make us perceive the turquoise differently making it appear either blue or green.
He started making his own one of a world map which you can see here which is pretty impressive. I decided to make a few of my own including a higher resolution version of his world map.
Do you see green land and blue water or orange land and purple water?
An Orange Butterfly
A Green Butterfly
What do you think?
I know that the last one wasn’t done very well, there was a small filling issue when I changed the Hue and Saturation but you can still get the idea.
EDIT: Would just like to say a big thank you to Richard Wiseman and John Matson @ Scientifig American. This illusion got picked up by them and I had a great response, a bit of a supprise. It has been posted here on the Scientific American Gallery
