When we took our project into "the wild" and wrangled some children to interact with the pinwheel at the library, we ran into a couple unforeseen difficulties: 1) part of the wall is only visible from any one location, diminishing the overall "sweeping" effect and 2) children are as easily distracted as they are impressed, so if you want to hold their attention for any length of time, you must focus on making their initial interaction with your concept very engaging.