Dot to dot

I have been meaning to post this album cover for a week or so, but have only just got round to the scanning. I found it back of the TV guide last week and thought it was an interesting optical effect.
It is surprisingly easy to see on the screen although I found the best way to view the paper version is in poor light with tired eyes. I am not entirely sure how it works, I guess that there is slight change in dot size to create the letters – it doesn’t have the look of one of the stereogram images and the result isn’t 3D. [Click for a larger version]

 

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