An \emph{interval vector} is a (0,1)-vector in Rn for which all
the 1's appear consecutively, and an \emph{interval-vector polytope} is the
convex hull of a set of interval vectors in Rn. We study three
particular classes of interval vector polytopes which exhibit interesting
geometric-combinatorial structures; e.g., one class has volumes equal to the
Catalan numbers, whereas another class has face numbers given by the Pascal
3-triangle.Comment: 10 pages, 3 figure