| http://www.w3.org/ns/prov#value | - The horizontal line at the bottom can be envisaged as either the front edge of a cube, or alternatively the rear edge.Since a Necker cube is a rather austere object, I thought it might be preferable to call upon one of the numerous fantastic graphical constructions of M C Escher [1898-1972], some of which might be described tersely (too tersely, of course, since the artist was a genius) as enhance
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