 The tree \((T,\lt)\) seems to correspond to a naïve picture familiar to us all: a moment \(m\) is a temporary present; the set \(\left\{n : n \lt m\right\}\) corresponds to the past of \(m\), which is unique; while the set \(\left\{n : m \lt n\right\}\) corresponds to the open future of \(m\), each particular maximal linear subset of which corresponds to a particular possible future.