This grand vision in turn required not only that Whitehead's original line of thought,
unredacted by Hartshorne, Christian, Leclerc and Cobb, be recovered (a task Lewis shared with Jorge Nobo), but also that the problems that Whitehead faced, as Whitehead envisioned them, and his various attempts at solution (ending presumably in the
views published and taken by most of us as the last word on the subject) be likewise exposed and rethought.