Fill the pen with tap water and begin exploring this lovely coloring book, where the theme is the many ways to travel. When the pages come into contact with water, beautiful elements and colors appear. Once the pages dry, the colors disappear, and the book can be reused again and again. The book is ideal for trips in the car, on the plane, or other forms of transport. It can provide hours of entertainment. Suitable for children aged 3 to 6 years.