northern lights in Wood Buffalo National Park. The holographic window includes the national coat of arms and a representation of the artwork Owl's Bouquet by Inuit artist Kenojuak Ashevak. It was first issued on 1 June 2017. $20 note The $20 note is green, and the obverse features a portrait of the Queen of Canada, Elizabeth II, based on a photograph commissioned by the Bank of Canada in the 2000s. It received approval from Elizabeth II for use on the banknote. The building in the holographic metallic foil is the Peace Tower of Parliament Hill, based on a photograph commissioned by the Bank of Canada. The reverse features the Canadian National Vimy Memorial, reflecting the contributions of Canada in conflicts throughout its military history. The memorial was erected on the highest point of Vimy Ridge on land permanently granted to Canada by the Government of France in 1922 to honour Canadian military service during World War I. The image is a rendering based on a photograph commissioned by the Bank of Canada. The reverse also features an artistic rendition of poppies and a Canadian flag waving. A report of the focus group study stated that most Canadians either did not recognize or were unaware of the Vimy Memorial, and thought the image represented the twin towers of the World Trade Center, though most Canadians recognized the name Vimy. Other focus group members stated concerns about nudity and pornography, both concerns in relation to the sculptures of nude women atop the memorial structure representing peace (Pax) and Lady Justice. The banknote was unveiled and released into circulation at a national ceremony at the Canadian War Museum in Ottawa, and also at several regional events, on 7 November 2012. On 9 September 2015, the Bank of Canada released a modified version of the banknote to commemorate Elizabeth II becoming the longest-reigning monarch of the United Kingdom and Canada. It is derived from the standard $20 2011 Frontier banknote, but replaces the images on the metallic foil with the royal cypher of Elizabeth II and a portrait of Elizabeth II adapted from a 1951 photograph by Yousuf Karsh. It was the first Canadian banknote to depict Elizabeth II wearing a tiara. This portrait was also used for the obverse of all banknotes of the 1954 Canadian Landscape series, including both variants of the Centennial $1 banknote issued in 1967 for the Canadian Centennial,