You may think you understand your senses and your brain, but here is a little test to blow your perception of what you see and how you see it. It will take a black and white photograph of a castle and make you see it in color.
Play the video above, which comes from the BBC Four series Colour: The Spectrum of Science, and follow the instructions. You will stare at a blue dot, which will overstimulate one of your three cone cells, causing it to tire and become unresponsive. This causes the other two, which are sensitive to red and green wavelengths, to take over and become the only two you have use of, until the other cone, sensitive to blue wavelengths, recharges.
Keep your eyes fixed, even after the blue dot disappears and you will be viewing a black and white photo in full color. If you are skeptical and think they switched the photograph to color, simply shift your gave to somewhere else on the picture and you will see that it is indeed black and white.
Here is another example of this phenomenon, from Cardiff University.
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