From the same good folks who brought us the Piano Stairs. I like the idea--people will modify their behavior if we make it fun--but I have my doubts about this one. Imagine sitting in the park and hearing this sound over and over and over again. Dreadful. Also, wouldn't you also hear whatever you've thrown in hitting the other trash as this sound is going on? And what if the trashcan is visibly nearly full? Starts to be less fun and more gimmicky feeling. But hey, I'm just sayin'...overall this is an awesome idea.