Many of the silk scrolls have darkened with age and this, combined with the gallery's low lighting and dark-brown walls, creates the feeling that we have stumbled into a hidden cache.

WSJ: Paths Easy and Daunting | Ming Masterpieces | Artful Recluse | Lacma | Asia Society | By Lee Lawrence

The UK's first cache was hidden in December last year and now another eight have been placed.

BBC: How to play hide-and-seek by satellite