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"Google Maps Envelopes" by designers Rahul Mahtani & Yofred Moik

Beginning as only a conceptual design, desiring for Google Maps to pick up the idea, users could map the course of snail mail on the envelop itself. The project further proposes people would be able to send these envelopes through the GMail interface itself.

Since then, many designers and web savvy artists have realized similar projects and one can print an approximate route from starting point to reciever right onto their envelope.