Postcards are impressive in their efficacy as vehicles for communication. Stamp a rectangular piece of thick paper and you can send off a note–no envelope required.
While post card production started in the late 18th century, the first modern photo postcard was sent in 1940. The customization of postcards enables you to personalize your message. You can print a postcard with a personal photo or buy one that has a design you like. Much can be conveyed in the visuals.
It is a major design feat to be able to pack so much information into this little card: to whom it is being sent, the message, the return address, etc.