In the movie, there's a treasure map.  The map is unusual.  In some 
scenes it's folding along right angles, just like road maps and the 
like.  But to reveal the location of the treasure, the road map has to 
be folded so that one corner of it is still on the same side as the rest 
of the map.

Is there a name for this kind of map?  Unless there's a recognized 
(probably Greek or Latin) term for it, I suggest "origamial map."

(There's always a treasure map in movies, and there's always treasure at 
the end of it.  That never happens in real life. Why can't we have this 
kind of map in real life?  Without the crazed thieves, alligators, 
gunfire. violence, and mudslides.)