  The orthogonal projection of a 4-cube onto a uniform random 3-subspace in R^4
is a convex 3-polyhedron P with 14 vertices almost surely. Three numerical
characteristics of P -- volume, surface area and mean width -- are studied.
These quantities, along with the Euler characteristic, form a basis of the
space of all additive continuous measures that are invariant under rigid
motions in R^3. While computing statistics of {vl, ar, mw}, we encounter the
generalized hypergeometric function, elliptic integrals and Catalan's constant.
A new constant 7.1185587167... also arises and deserves further attention.
