It turns out the master designer behind this somewhat creepy form is in fact a tiny spider, only about 5mm in body length, that is hiding behind or above that false, bigger spider made up of debris. After discussing with several spider experts, we've determined it is quite probable that this spider is a never-before-seen species in the genus Cyclosa. This genus is known for having spiders that put debris in their webs to either attract prey or, as in this case, confuse anything trying to eat them.