  To make progress on the open questions on CME/CIR propagation, their
interactions and the role and nature of the ambient solar wind, we need
spatially resolved coverage of the inner heliosphere -- both in-situ and
(critically) imaging -- at temporal scales matching the evolutionary timescales
of these phenomena (tens of minutes to hours), and from multiple vantage
points. The polar vantage is uniquely beneficial because of the wide coverage
and unique perspective it provides. The ultimate goal is to achieve full $4\pi$
coverage of the solar surface and atmosphere by 2050.
