According to Osho, apara names the outer, gross, sense-known side of existence—the visible ‘tree’—while para denotes the inner, causal, conscious root, the source-power. They are not two realities but one seamless continuum; the division is only for teaching. Yet there is a functional asymmetry: para is primary and potent (roots), apara derivative (branches). Realization unites them as a single, nondual weave.
Apara is what you can see like a tree’s branches, para is the hidden root-power that gives it life—and they’re actually one thing.