Sento Sphere Mini Aquarellum Butterflies Watercolor Paint Set Aquarellum sets are easy to use sets feature a distinct and unique method that makes painting-by numbers obsolete. Unique embossed picture cards absorb paint in some areas and repel it in others creating intricate, detailed works of art that even the youngest children can achieve. The design is gradually revealed with every brush stroke and may be painted over repeatedly to obtain a perfect picture Parents describe aquarellum as captivating and relaxing for both themselves and their children. This activity is ideal to initiate children in the art of painting, understanding the mixing of colors and stimulating their imagination and concentration.