Maybe it's not so different to long-time cel 
collectors.  The cel itself is little Eriol 
lurking on the roof, there is a matching 
production background (^_^) and the house is 
painted on a stiff paper and placed on top of the 
cel!  I've always thought of it as a sandwich cel!

It's from Card Captor Sakura and the cel # is A1 
end.

Is there a better, or more accurate name for this 
kind of cel?  I'd love to know!

-Kitt