The girls have interacted with this exhibit many times over the last few years. This may have been the first time they used it in the way that the designers had intended it!
One thing I love about our museum membership is that we have the opportunity to come back to the same exhibits over and over and see them with new eyes. The fact that they have their own ideas about using them and the interesting ways those ideas change is just as wonderful to me as when they follow the intended instructions. All interactions are learning and all learning is awesome!