581. Have the same mundane object show up all over the place. For example:
Session 1: "...You walk through the door and find yourself in a 30 by 30 foot room. There is a door to the north, and a small pile of junk in the corner. A small, red clay jar is on top of the pile."
Session 2: "...The tavern is well-furnished, bright, and warm. There is a lot of hubbub coming from the customers. As you approach the counter, you notice a small red clay jar on the counter just before the barkeep picks it up and puts it away."
Session 3: "...The town, though small, is bustling with activity. There are children playing, women haning laundry on the line, and a man carrying a small red clay jar into his house.
Keep it up forever.