Looking for Very Specific Children's Picture Book?

There was a picture book that I got from the library as a child that I loved but haven't been able to find as an adult. It had these giant, fully colored and intricate pictures on each page that had a lot going on in each one.  Sort of like "Where's Waldo" drawings but more realistically drawn. I don't even remember if there were any words or if they were just pictures but it was the sort of thing you could look at for hours. I think the pictures may have also started as one picture on one side of the page but then faded into something else. For example a girl in a bed, but as the bed sheet went down the rest of the drawing morphed into a drawing of a city or something. That's the best I can describe it. I feel like if you've seen it you'll know what I'm talking about. Anyway, any suggestions for what this book might be would be super appreciated. 

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