Midisuperspace Foam*

I describe a midisuperspace -- a model for quantum gravity in which most of the degrees of freedom are frozen out -- that is rich enough to allow a version of Wheeler's spacetime foam.   In this setting the Wheeler-DeWitt equation becomes tractable, and there is strong evidence that wave functions can be nearly time independent even in the presence of a large cosmological constant, with expansion in some regions balanced by contraction in others.