Electron delocalization realized in both acyclic and cyclic $\ce{\uppi\!\mbox{-}conjugated}$, 1, and $\ce{\upsigma\!\mbox{-}bonded}$, 2, ribbon-like systems. For cyclic systems, a variety of linkage fashions between several ribbons (pericyclic, spirocyclic, longicyclic and laticyclic) is possible.