  Quantum field theory in zero spatial dimensions has a rich infrared landscape
and a universal ultraviolet, inverting the usual Wilsonian paradigm. For
holographic theories this implies a rich landscape of asymptotically AdS$_2$
geometries. Isolating the interiors of these spacetimes suggests a study of the
analog of the $T\overline{T}$ deformation in quantum mechanics, which we pursue
here. An equivalent description of this deformation in terms of coupling to
worldline gravity is proposed, and applications to quantum mechanical systems -
including the Schwarzian theory - are studied.
