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There is an Optic Illusion...

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...taken from this web page that deals with Frequency Separation. This image is obtained by having Albert Einstein in the High Frequency layer which is sharp while there is an image of Marilyn Monroe in the Low Frequency layer which is blurred. You would be able to see Marilyn Monroe when you move away from the screen and see the image from a distance or just see the image with focus being off the screen while squinting.

The blurring is done in Low Frequency layer to retain the general colour in patches while forgetting the finer details. It is the responsibility of the High Frequency layer to remember the finer details. Together, they complete the image but this separation gives you the option to deal with colour issues without affecting finer details in one layer while dealing with finer details in another layer without affecting colour.