Title: On recognizing shapes of polytopes from their shadows,
Abstract: Let $P$ and $Q$ be two convex polytopes both contained in the interior of an
Euclidean ball $r\textbf{B}^{d}$. We prove that $P=Q$ provided that their sight
cones from any point on the sphere $rS^{d-1}$ are congruent. We also prove an
analogous result for spherical projections.