Downstairs, there is a room almost no one knows about.  A long corridor leads you there – you have waited ages for this chance to see what is not seen.  Your guide opens a door marked ‘A’; the air is still and inside it’s hushed; sounds are deadened, insulated as if in a vault.  Perhaps you are.

This is Room A at the National Galley in London where one day a week visitors can look at works by European masters that are not to be seen hanging on the main Gallery walls.

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