Weclome, inse!

Furniture and artworks with secret compartments have been a fascinating area of craftsmanship thought the ages:

http://www.hygra.com/tc2/tcchsd.htm

It’s a tradition still kept alive:

http://www.varah.co.uk/cabinets.htm

One sometimes wonders where the secret compartment might be accessed…

http://www.deco-days.com/items/264519/item264519store.html



Since I can’t find an existing term, how about secret compaintment, or alternatively false frame?
Though neither is entirely neat and apposite... <grumble, grumble>