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Adult coloring books are all the rage. Some of my friends have one, my parents got one on an outing with brothers and sisters, and I have been known to color a mandala or two. But now I have a real adult coloring book. And this book, called The Soul Discovery Coloring Book is a little different from just an average adult coloring book.
Why have those coloring books become so popular? It is not all of a sudden…
