Postcards are messages sent by Uncle Traveling Matt back to his nephew, Gobo. Matt's messages describe the interesting things he's discovered in Outer Space -- often misunderstanding what he's seen, and interpreting it from his own Fraggle point of view. When the postcards arrive at Doc's workshop, Doc invariably throws them in the trash -- where Gobo can retrieve them. Gobo enjoys reading Matt's postcards, although some of the other Fraggles find them tedious -- especially Red.