Jill: Tim, honey, don't use the blue sponge on the counter.
Tim: Huh?
Jill: The blue sponge is for the dishes. The green sponge is for the counter.
Tim: What's the difference?
Jill: Well, you're not supposed to use the same sponge on the counter as the dishes.
Tim: So, the blue sponge is just for the sink?
Jill: No, not always. When the blue sponge gets dirty, it gets demoted from the dishes to the counter. The green sponge gets demoted from the counter to the floor. Then I pull a new one out from here. It might be blue, it might be yellow. [Tim grunts]