"Imagine you're randomly brushing paint on a blank page when suddenly a picture begins appearing in white against the watercolor background. Since the preprinted invisible lines resist the paint, hidden designs are revealed with every stroke of the brush. The paints are real watercolors, yet non-permanent and kid-friendly. The easy-to-handle foam brush is designed to soak up just the right amount of water and paint. And there's a handy paint palette built right into the cover of the book. "