  We visualize the Kohn-Sham kinetic energy density (KED), and the ingredients
-- the electron density, its gradient and Laplacian -- used to construct
orbital-free models of it, for the AE6 test set of molecules. These are
compared to related quantities used in metaGGA's, to characterize two important
limits -- the gradient expansion and the localized-electron limit typified by
the covalent bond. We find the second-order gradient expansion of the KED to be
a surprisingly successful predictor of the exact KED, particularly at low
densities where this approximation fails for exchange. This contradicts the
conjointness conjecture that the optimal enhancement factors for orbital-free
kinetic and exchange energy functionals are identical. In addition we find
significant problems with a recent metaGGA-level orbital-free KED, especially
for regions of strong electron localization. We define an orbital-free
description of electron localization and a revised metaGGA that improves upon
atomization energies significantly.
