Yes, sometimes refreshing moves where the image is slightly, making it a bit easier to see.
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There are also several colors of eggs. I found that the blue with green spot (or was it green with blue? I don't remember) was the hardest to see. The colors blend in with the flowers on the borders VERY well so are hard to spot. Move your mouse around the flower/ivy borders of each page, and see if it turns into a hand.