Why Coloring Books Are Trending Among Adults

Adult coloring books are hot sellers this holiday season, marketed as a way to relax and reduce stress.
5:14 | 12/16/15

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Transcript for Why Coloring Books Are Trending Among Adults
coloring party. Reporter: Katherine McHenry owns a Chicago toy store and hosts a weekly byob party. The main attraction, an unlikely adult treasure, coloring book. Customers of mine who come in the store I would tell them about the really rewarding positive experience I was getting through coloring and slowly one by one they were buying it. Reporter: These coloring books are different and more complex than the traditional books for kids but the effects are similar. I mean we all colored when we were little. It's a cathartic experience, relaxing. Reporter: The popularity is staggering. Amazon.com sells more than 5,000 different types from stress management to nature. Even harry potter. Among the most popular, secret garden which has sold more than 6 million copies worldwide. 911, what's your emergency. Reporter: At the Sacramento police department, the emergency dispatchers feel the pressure from start to finish. It gets pretty hectic. It can go from just being absolutely quiet to being mass chaos in seconds. Reporter: They spend the day supporting others, but their life line, coloring in the lines. It definitely calms me down and gives me something else to focus on. Reporter: This holiday season you may forgo the tablet for some good old-fashioned pencil and paper. Something unexpected and something new and I think it's a great gift. Oh, my gosh. Over here? Over here, over here, over here. Will Ferrell has got a coloring party going on here and look who's coloring with us, will. He knows he's going to keep it clean because his mom Kay is here and psychiatrist Dr. Janet Taylor, the reason we're doing this. You see how quiet they got. I've never seen them so quiet. There is something behind it. It's the activity. When you bring your attention to something it not only simulates the mind and brain lights up but relaxation response and what we need in this busy world. It's the focus. Can you keep it down? Was he always like this as a kid? Was he always like this as a child? The point is, you know, when you're stressed you can find activities and going to it mindfully and sometimes quietly helps. There is something scientific about it, too. There's a part of our brain that is really stimulated by this. And that is right here. The hypothalamus -- that's where stress enters the brain and that's what -- can induce a relax response. It's intentional and shows that we have control over our actions and behaviors and intentionally we know when we need a break and coloring, repetitive activities are a great way to do that. Even if it's competitive coloring with six people. The key is not competition. It's not about mastering the skill. When you garden or -- It's not about performance but process. Yeah, Amy. And bringing your attention -- Wait a minute. For all you competitive people down there. But I mean you guys are really into this? Yes. I love it. I love it. I would do this. Can I bring this to the hospital to try to do during labor? Would that work. That would work it out but is this something you would say, hey, why not? Give it a shot. I mean, you know, people say is it therapy? It's therapeutic and, again, it's about knowing what you need to do and finding those activities whether it's going for a walk, mindful breathing, it's drumming. It helps and it has a specific aspect of the brain that it correlates too. Pencils down. Would you like to show your work? Would you like to show -- I thought this was -- I didn't get that far. Can I show George's. I'm not sure, Janet, if you can give us an analysis. What are you saying, doctor? I only give analysis when I'm getting paid for it but it's wonderful, George. Very creative. Now at the end, Amy. I have some flowers. I stuck with the one line. There's something if you go outside the line -- I stayed inside the line. It's about you just enjoying it, having fun. I'm just joking. That's a joke. That's a joke. That's a joke. Not relaxed at all. All right. Your mom is really focused. Thank you, will. Thank you, everyone. Thank you, Janet. As always. Coming up -- emeril is sharing some of the

This transcript has been automatically generated and may not be 100% accurate.

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