That's why it's "in the corner." Because the stamp is glued down, the postal stamp and the corner never move in relation to one other. However, the envelope, the corner, and the stamp are all traveling across the world at the same time. Because the envelope is most likely in the postman's satchel, vehicle, or possibly an international postal jet. The stamp will be in an office near you! Also worth mentioning is that because the postal service needs to make sure that letters do not go missing, they also use tracking numbers/codes with every letter sent so that if the letter gets lost or goes astray, they can find it again. This concept was first introduced by Benjamin Franklin and has been used ever since. He invented a printing press for use by the American colonies that was based on the same design as his original invention - the electric typewriter! In conclusion, the postage stamp sits in the corner because that's where it's glued.