Everyone must have had at least one argument with someone who sees colours in a slightly different way. Of course, it can be pretty irritating to persuade this stubborn person that your lovely coat is green, not purple, or to explain that the fruit are not ripe - the situations are numerous. But have you ever wondered that the real reason why it happens so often is... colour blindness? Yeah, all of a sudden it turned out that every 10th person in the world can't distinguish colours correctly. Guess you are that number 10? Watch and prove!