Roald Dahls, Matilda has sold 17 million copies worldwide since it was published in 1988 and has recently become his most popular title. It is a traditional favourite novel for many children and is now available on the front of a birthday card for 6-year-olds. Yellow and orange stripes are the sit in the background of the front of this birthday card with Matilda in the foreground, arms open to the recipient of the card. Yippee 6 today' is written on written text on the cover and have a truly amazing birthday is written on the inside.