Borderline aromatics: The series of compounds of composition CBnHn+1− is now completed with the simplest three‐dimensional aromatic 1. The precursor 2, a two‐dimensional aromatic, and the product of protonation, 3, a homoaromatic, display partially nonclassical σ frameworks. R=SiMe3, Dur=2,3,5,6‐tetramethylphenyl.