In 2006 a commissioned work by Petrick was exhibited at Shalom College at the University of New South Wales as part of a charity fundraising exhibition . It sold for A $ 22 @,@ 000 . As of the end of 2008 , the highest recorded auction price for an item of Petrick 's work was $ 22 @,@ 800 , set in May 2007 . An image based on a triptych by Petrick , Bush Berries , appears on the cover of a book on the visual perception of motion , Motion Vision .