These color-by-number books are called Querkles and they are part coloring book, part puzzle, and look completely fun! The author’s name is Thomas Pavitte and here’s a video of him using the same technique in his …
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Adult Coloribg: Start Relaxing Go Color by Numbers. Here are 5 Free Prints and a Color Chart to Kick It Off with! From "Creative Haven Horses Color by Number Coloring Book". Published snd for sale at the great Dover Publications.
If you blacken the areas numbered and 4 in the illustration below, you will see a picture. If you instead blacken the areas numbered and you’ll see a different image. And a third picture is revealed if you instead blacken the areas numbered and