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The white space formed by the inner margins of two facing pages (near the spine) in a bound book, journal, or newspaper.
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The inside margins or blank space between two facing pages of a magazine or book is called the gutter.
The gutter space is allowed due to the space lost during the binding process, especially during perfect binding.
In saddled-stitched publications the gutter is adjusted o allow for a process called ‘creep’, in which the outer pages of a section appear to bunch up and the inner pages protrude more.