And the same information in a spiral format.
The first envelope is not corn, or a church, or an electrical circuit, or an air port terminal map. It's not a seating chart, a game, a pill, a button hole attachment or a martian cribbage board. And it's not a football field, or a zipper. The stamps may have been a bit of a red herring, however I used them because the first image makes me think of corn.
It's an abstracted map of the Newcastle metro system. Here's the current official map.