The Little Yellow Digger quickly became a favourite with children around the country, but the illustrator, Alan Gilderdale's artistic expertise extended far beyond mechanical devices. His wife Betty and son Peter have spent the two years since Alan's death going through a vast back catalogue of paintings, drawings and lithographs, to put on a retrospective exhibition on Auckland. This will be the first time much of it's been seen in public. Lynn Freeman speaks to Peter Gilderdale, who is a senior lecturer in design at AUT University and to the exhibition's curator Warwick Brown. The Alan Gilderdale retrospective will by on display at the Northart Gallery in Northcote.