An open zipper creates two hills revealing the recurring landscape motif with tree and mountains. Buildings on the left hold a secret.
This card has one or more secrets. Can you find them? Here's a hint:
The hidden figure has to do with POSTNET.
The buildings hold the key (or should I say code).
Each building is tall or short. The tall-short combination creates the POSTNET bars for the number 52 (the card number).