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The Art of Yorkshire garden at the 2011 Chelsea Flower Show celebrates the work of a number of artists who were either born in the county or who have been inspired by its landscape. David Hockney is represented through a giant iPad on an easel which frames views of the garden, acknowledging the continuing significance of the notion of the picture plane or perspective window.  The illusion of a painted surface is enhanced by the cut-away easel. (photo copyright © Russell Light) Hockney has extensively explored the use of optical devices such as the camera lucida in the history of art. His recent exhibitions have featured digital art on iPads made using the app Brushes. The garden, which also features Barbara Hepworth's 'Ascending Form', won a Silver Medal at the show. A 3 part film with an interview with the designer, Kate Dundas, is available on the Guardian website. Sources: D Hockney (2001) - 'Secret Knowledge: Rediscovering the Lost Techniques of the Old Masters

Anamorphic coffee cup, designed by Ross McBride. The distorted lettering on the porcelain saucer is reflected in the mirrored stainless steel cup. The 'corrected' reflection in the cylindrical surface enables the lettering to be read clearly. Tea also available... (photos copyright © Russell Light) These designs are based on the same principles as anamorphoric paintings which became popular in the 17th century. Anamorphic pictures were often used to conceal political, religious and erotic images. The theory and practice of anamorphosis was first set out by Jean François Niceron in his 'La Perspective Curieuse', which was published in Paris in 1638. Laurante - Anamorphosis, 1630 (source: Wikimedia Commons) See also: The Brothers Quay and Anamorphosis