The Brightest Part of a Shadow is in the Middle

Why is there a bright spot behind spherical objects?
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Filmed by Nathan Watkins and Raquel Nuno, animation by Meg Rosenburg. Music by Kevin MacLeod, http://www.incompetech.com 'Scissors' 'Mirage' ' Marty Gots a Plan'. Special thanks to Laura Vican for helping with the experiment.

References:
http://www.princeton.edu/~rvdb..../images/Questar/Pois
Why Toast Lands Jelly-side Down: Zen and the Art of Physics Demonstrations By Robert Ehrlich