When I was younger, I used to collect postcards. I had a few pen pals before. We exchanged letters thru post. We sent souvenirs to each other like postcards or simple arts and crafts. We even sent photographs, too. 🙂 It was a nice feeling to receive letters from my pen friends with postcards enclosed. Because I feel like I have visited them in person just looking at the pictures and souvenirs. Some of my pen pal stayed in touch with me for a long time, some stopped because time came when we had to face the most important priority in our lives back then-college.