  We present a simple geometrical "fluidic" approximation to the non-adiabatic
part of the Kohn-Sham potential, $v_{\mathrm{KS}}$, of time-dependent density
functional theory. This part of $v_{\mathrm{KS}}$ is often crucial, but most
practical functional approximations utilize an adiabatic approach based on
ground-state DFT. For a variety of prototype systems, we calculate the exact
time-dependent electron density, and find that the fluidic approximation
corrects a large part of the error arising from the "exact adiabatic" approach,
even when the system is evolving far from adiabatically.
