Nematic polymorphism: (a) molecular structures of RM734 and DIO, with transition temperatures (°C), and polar ellipsoid representation used elsewhere in this Figure . Programmatically generated cartoon depictions of ellipsoids forming a conventional apolar nematic phase (b) and polar nematic phase (c), with order parameters (<P2>) of 0.60 and 0.67, respectively. Cartoon depictions of the precession of the nematic director in the helical chiral nematic phase (d) and heliconical twist-bend nematic phase (e).