Roald Dahl', 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 8-year-olds. Matilda is pictured on the front, floating in the air grasping a book. This Quentin Blake illustration of Matilda is accompanied by the message 'Hooray! 8 today' on the top of a yellow and orange horizontal line, background. The inside message of the card reads: 'Hope your birthday is truly extraordinary 'just like you!'