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31st March 2015
09:12pm BST

Michael's reasoning for the blue and red appearance of the bills is relatively easy to comprehend.
He says that we see different hues depending on the background colour of the image and that blind spots can interfere with how we see different colours.
Michael said: "Our visual data is actually astonishingly sparse and even if we were able to accurately record and process every photon that reaches our eyes, we’d still have too little data to be able to reconstruct the world accurately.
"Our visual system takes its best guess and sends that to the conscious mind".
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