of children of different ethnic backgrounds building a snowman and playing hockey, and of faces of individuals from different cultures celebrating Canada Day. The focus groups rejected images such as aboriginal art, ice wine, and portraits of Terry Fox, Tommy Douglas, and Lester B. Pearson. All focus groups thought the large window resembled a woman's body. A set of 41 images in several themes was presented to the Department of Finance, which selected the final designs. Rejected images included illustrations of a gay marriage and a Royal Canadian Mounted Police (RCMP) officer wearing a turban. The images and themes that were chosen were meant to represent Canadian accomplishments in science, technology, and exploration. The themes for the final designs were announced to the public at a media event on 20 June 2011 by Mark Carney, the Governor of the Bank of Canada, Jim Flaherty, the Minister of Finance, and William J. S. Elliott, commissioner of the RCMP. Accessibility Each banknote has a raised dot identification pattern, which is not braille, on the top left corner of the obverse usable for identification by individuals with visual impairments. The raised dots were expected to have greater endurance than those of previous series because of the greater durability of the polypropylene substrate. At each end of the banknotes, a symmetrical arc contains codes that enable identification using a specialized portable electronic banknote scanner. Other accessibility features include a distinct and dominant colour scheme for each denomination and large numerals displayed against a contrasting background Production The banknotes are manufactured by Ottawa-based company Canadian Bank Note Company and by the former BA International. They are made from a single sheet of polymer substrate branded as "Guardian" manufactured by Innovia Films, which is the only supplier of the substrate for the Frontier series, based on a polymer developed in Australia and used by Note Printing Australia to print the banknotes of the Australian dollar since 1988. The material is less likely to tear than cotton-based paper and is more crumple resistant and water resistant. The polymer notes are made of recyclable biaxially-oriented polypropylene (BOPP). Each polymer banknote cost 19 cents to print, more than the paper-based banknotes of previous series, but were expected to last 2 times longer, about 7 years, reducing overall costs for banknote production. The Bank of Canada expected to save about 25% on production costs (about $200 million) compared to printing