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Can you see the red flowers in the middle of this photo of our garden? Well I can't. I think it's because I am colour blind but it might be because there aren't any, only you can tell (assuming you are not colour blind too). When the first edition of the SL book came out we had the reverse problem. There was a photo of a colour blindness test that had been picked by someone who wasn't colour blind and I could see the number that I wasn't supposed to see quite clearly.