I love a point of view like this. To me, it seems to force the viewer into the image and become part of the image. When you shoot from below, typically a subject can make the viewer feel as though the subject is in control of a situation. The simple act of looking up at a subject/object can impart a loss of control or the idea that the object is unobtainable. In this case, since the subject is bound, it throws that notion topsy-turvy— which I think makes for a nice tension.