■ It’s a fine summer’s evening, and a girl gazes out of the window at the view beyond. Except that, in the top version, there’s no sense of the window itself being present: sure, we can see the frame, but the glass is missing. In the second version, we’ve added a ‘reflection’ of the room onto the glass. In fact, this is just a photograph of a different room placed behind the window frame at an opacity of 20%. It gives the glass some substance, a sense of it existing in the real world.
GLASS, WE’RE TOLD, is really a liquid. Which ...
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