As I mentioned in this post, people here seem to think that shiny things scare away unwanted animals. While this might be true, it seems to me that often the shiny things are more of an eyesore than the animals.
Here is a CD suspended from some wire in a very public part of campus. I believe the contraption is designed to scare away birds. While this probably works, it contrasts sharply with the orderly and professional look of everything else around campus.