The cover shows a fluorescence microscopy image of solvent-vapor annealed (SVA) films of an alkylated perylene-bis (dicarboximide), reported by Vincenzo Palermo, Klaus Müllen, Paolo Samorì, and co-workers on p. 3791. Upon exposure to tetrahydrofuran vapors, ultrathin films exhibiting needle-like structures rearrange into millimeter-long fibers, which have a sub-micrometer cross section. The SVA growth was found to be a nucleation-governed process leading to the formation of birefringent fibers on various substrates.(The result was obtained in the framework of the ESF-EUROCORES-SONS2-SUPRAMATES project.)