Those of us who grew up coloring remember the cardinal rule: stay inside the lines. But those who pick up the Patterns of the Universe coloring book have to stay in the sines (and cosines and tangents).

Cover Image courtesy The Experiment

The book, a collaboration between Guardian writer Alex Bellos and artist Edmund Harriss, is meant to inject some braininess into the relatively simple act of coloring, while not sacrificing the chance it gives your brain to decompress.

“The images in the book are gorgeous. They are also designed to give insight and illumination,” says Bellos. “Coloring in—itself a meditative experience—seemed like the perfect way to introduce the eternal truths and abstract perfection of the mathematical world.”

Patterns of the Universe, out tomorrow, contains 65 different coloring options that let you illustrate everything from fractals to octahedrons. WIRED asked Bellos for his thoughts on some of the best of the bunch.

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You’re Never Too Old to Color—Especially Math Patterns