The Polish Post, Poczta Polska, has issued a special postcard to commemorate the flight, which you can send by our special balloon postal service. The postcards will be available shortly before the flight. On the front of the card you can see the panorama of Warsaw, with two balloons hovering above. The two balloons are in the project logo, however it is possible that one more balloon will take part in the mission.
On the other side of the card you will find a series of mysterious symbols of the city. Those who guess the meaning of all of them and send their list at firstname.lastname@example.org with a note “encoded symbols of Warsaw”, will take part in a lottery. The winners will receive The Warsaw Triptych albums.