  Imaging the quantum motion of electrons not only in real-time, but also in
real-space is essential to understand for example bond breaking and formation
in molecules, and charge migration in peptides and biological systems.
Time-resolved imaging interrogates the unfolding electronic motion in such
systems. We find that scattering patterns, obtained by X-ray time-resolved
imaging from an electronic wavepacket, encode spatial and temporal correlations
that deviate substantially from the common notion of the instantaneous
electronic density as the key quantity being probed. Surprisingly, the patterns
provide an unusually visual manifestation of the quantum nature of light. This
quantum nature becomes central only for non-stationary electronic states and
has profound consequences for time-resolved imaging.
