Big boxes rarely come through our lives. I mean really, how often do you purchase a furnace, or water heater? When Dave finished installing a new heater at my mom's, he threw the box in the back of his truck to recycle it (ahhh, the power of a neurotically-recycling wife). A few days later, as I was taking a much needed break upstairs and away from the kids, I kept hearing the oddest sound. When I came downstairs an hour later, the kids were happily playing in their new "house." It's provided hours of fun, and a welcome distraction when I'm trying to cook dinner. I love the imagination and ease of childhood, when a taped up (ya know, cardboard can be sharp) water heater box can become anything from a spaceship to a store.
And being naked only adds to the cuteness.