Nature is an expert at self-assembly. Your body, as a whole, is a complex compartmentalised system of molecules, reactions, and replicators, all underpinned by self-assembly and supramolecular chemistry.
All matter exhibits a Faraday effect: the polarisation of light as it passes through a material changes proportional to the strength of an external magnetic field.
Aromatic molecules are cyclic and pi-conjugated, and exhibit some interesting effects. Most well-known nowadays is the behaviour of aromatic molecules in a magnetic field: in an NMR spectrometer, we see that the chemical shifts of protons inside and outside the ring are anamolously (de)shielded.