Minor vs. Phrygian

The first of these is the natural minor scale - Aeolian, in Greek-mode terms - and both start on C.

The wheel makes the difference positional rather than verbal: the second-degree wedge sits one wedge further counterclockwise in Phrygian, and the spoke drawn from the center recolors to the interval that degree now forms with the tonic. Everything else on the two wheels is identical.

That single degree is the whole reason Phrygian sounds unsettled where the natural minor sounds merely sad: a half-step down from the tonic is the tightest interval a scale can open right at its root, and no other common minor mode has it. Reading it is one thing; the difference is much more obvious held under a drone, which is what the links under each figure are for.