All eight cases start from the same place: they all cover the majority of the iPod touch?s sides and back, almost all of its face aside from its screen and Home button, and part of its top. Each one leaves part of touch?s bottom open, and provides some direct access for light to reach its brightness sensor. And they all try aggressively to complement the iPod touch?s thinness rather than radically thickening it with additional material.?