There are many kinds of adult coloring books. Some are based on topics (cats, dogs), types of designs (mandalas, geometric), and purposes (anti-stress), etc
Coloring Therapy Mandala
Good News, Doodlers! Psychologists Say Adult Coloring Books Actually Do Lower Stress
Online Colouring and Quiz Activities for Adults - Michael O'Mara Books
Color Me Cautious: Don't Mistake Adult Coloring Books for Art Therapy, Columbian College of Arts & Sciences
7 Benefits of Coloring For Adults and Why You Should Try It – ColorIt
25 Best Adult Coloring Books 2022
Art therapy coloring page. Colouring pictures with Cute Village House in Winter. Coloring books make you feel better. Coloring drawings is an effective art therapy practice Stock Vector
Why adult coloring books are good for you
Art Therapy Colouring - Michael O'Mara Books
Coloring book - Wikipedia