Colin McCahon, Gordon Walters, Rita Angus - those are just some of the artists whose work is included in a stunning collection due to go under the hammer next month. The Bank of New Zealand collection was put together in the 1980s by influential art dealer and historian Peter McLeavey and features some of the country's finest artworks, including the last three works painted by Colin McCahon. Director of Art at Webbs Auctions Charles Ninow speaks to Karyn about the collection.