Using this magic water doodle book is super easy. First, fill the pen with water from a regular tap or a small container. Then, gently brush the pen tip over the paper in the book. As you do, beautiful sea - themed pictures will start to show up. There are no messy paints or inks, so it's great for travel. Remember not to press too hard on the pen, or the water might come out too fast and make a mess. When you're done using it, let the pen dry a bit before putting it away. Keep the book in a dry place to make sure the paper stays in good condition. You can use it again and again as the pictures will disappear once the water dries, ready for new doodles.