It’s common practice to cover drawings with a sheet of paper if the material used, such as charcoal, is likely to transfer on to the opposite page. Christopher rarely bothered with this, and in fact seemed to relish in the ghostly mirror-images that occupied the otherwise blank pages of his sketchbooks. These chance expansions of the original drawing allowed the image to be overlayed in a unusual way or doubled to populate both pages, creating a busier scene or literally extending the image into a completely new composition.

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