Johanna Basford is the author of two of our favorite adult coloring books: Enchanted Forest and Secret Garden. The Scottish Illustrator has already sold 2 million copies of these books and is planning to release a new one, which you can already pre-order here! In her interview to BBC, she has shared the reason behind her success. The opinion is unbiased, as an adult coloring fan Sophie Garner has our backs covered! No more words, just watch the video.