Sweet, Knitting Mermaids And Playful Seal Pups Abound In Colour By Numbers – Mermaids And Friends, A Colouring Set For Little Creatives. This One’S For The Kids Who Like Some Direction With Their Artistic Exploration As The Built-In Colour Key Encourages Confidence With Colour Placement. Colour By Numbers Is Great For Focus And Concentration And Promotes A Sense Of Achievement Once Complete.