Riemannian manifolds, particularly those with positive or nonnegative
curvature, are constructed from only a handful by means of metric
fibrations or deformations thereof. This text documents some of these
constructions, many of which have only appeared in journal form. The
emphasis is less on the fibration itself and more on how to use it to
either construct or understand a metric with curvature of fixed sign on
a given space.