Let your creative imagination go wild with the Aqua doodle Classic mat. It’s very easy to use, simply fill the Aqua doodle pen with ordinary tap water, run the nib over the magic mat, and see the colors appear! Any water that does run off the mat, runs clear. As your drawings dry, designs fade away, ready for the mat to be used over and over again. When you need to, just refill the Aqua doodle pen with water and go again!