Via Stewart Cowan's great Real Street blog, I came across this illusion from the Daily Mail:
I love illusions and thought they cannot be the same. I covered up the squares with pieces of paper and my hands and was still convinced they were different shades of grey. However I cut out the squares from the image using Macromedia Fireworks and this is what I got:
Don't always believe what your brain is telling you.
What jobs do UK workers actually do?
2 hours ago