This is an amazingly entertaining video for a physics video, and covers a subject that few even know is serious physics. What he does not talk about is the Penumbra is also a subject of study now that the Monstrous Moonshine Conjecture has been established, making it possible to measure macroscopic infinities. Theoretically, it is possible to establish that shadows and other things like our own ignorance are macroscopic manifestations of quantum indeterminacy. Hence, the drastic differences we perceive between our macroscopic existence and that of uber tiny quanta can be explained, in part, as our ignorance growing faster than our ability to examine anything. Quanta have so few measurable properties to begin with, we might as well be ants climbing the empire state building and confused as to why everything is blurring on the horizon the higher we climb.
