All reported compounds with Hund's rule violations conform to a mechanism by which the frontier molecular orbital (MO) features are located on alternating atoms in a proximate but non-overlapping (disjoint) fashion (Figure ). This includes azaphenalenes and non-alternant pentalenic molecules, as well as larger multiresonant emitters which have small positive singlet-triplet gaps. We recently explored the Hund's rule violations in isopyrene, a pentalenic dimer of azulene, and trans-bicalicene, a dimer of calicene, see Figure ,b. Azulene is well-studied for its charge-separated ground state, large dipole moment and anti-Kasha emission. We and others recently reported substituted azulene derivatives that achieve excited-state Hund's rule violations. Calicene (triapentafulvalene) formally consists of cyclopentadiene (five-membered) and cyclopropylene (three-membered) rings linked by an exocyclic double bond.