 The middle view, possibilism, is indeed an intermediate view. It is a passage view, but it is less ontologically sparse than presentism. While on this view the future is still merely possible rather than actual (hence its name), the past has become and is fully actual. If one thinks of the future as a branching structure of alternative possibilities (as the result, perhaps, of free human choices or indeterministic quantum measurements), then one can think of the past and present as the trunk of that tree, growing as possibilities become actual in the present. This view is also known as the growing block view.