Roald Dahl on 13 September is celebrated as "Roald Dahl Day" in Africa, the United Kingdom and Latin America. In honour of Dahl, the Royal Gibraltar Post Office issued a set of four stamps in 2010 featuring Quentin Blake's original illustrations for four of the children's books written by Dahl during his long career; "The BFG", "The Twits", "Charlie and the Chocolate Factory", and "Matilda". A set of six stamps was issued by Royal Mail in 2012, featuring Blake's illustrations for "Charlie and the Chocolate Factory", "The Twits", "The Witches", "Matilda", "Fantastic Mr Fox", and "James and the Giant Peach". Dahl's influence
Roald Dahl fox family in "Fantastic Mr Fox" and the trolls in "The Minpins". Receiving the 1983 World Fantasy Award for Life Achievement, Dahl encouraged his children and his readers to let their imagination run free. His daughter Lucy stated "his spirit was so large and so big he taught us to believe in magic." Dahl was also famous for his inventive, playful use of language, which was a key element to his writing. He would invent new words by scribbling down his words before swapping letters around and adopting spoonerisms and malapropisms. The lexicographer Dr Susan Rennie stated that Dahl built