Finally, these two pictures are very different.

You could have consciously come to that conclusion -- if you tried. But you didn't have to use your conscious brain at all. Instead, your unconscious brain automatically calculates the similarity. Then you conscious experience just the answer, the amount of similarity between the two pictures.

The same thing happens in focusing. When you guess at the meaning of a thought, your brain can tell you how well your guess matches the thought.

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