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About forty years after its discovery, it is still common to read in the literature that quasicrystals (QCs) occupy an intermediate position between amorphous materials and periodic crystals. However, QCs exhibit high-quality diffraction patterns containing a collection of discrete Bragg reflections at variance with amorphous phases. Accordingly, these materials must be properly regarded as long-range ordered materials with a symmetry incompatible with translation invariance. This misleading conceptual status can probably arise from the use of notions borrowed from the amorphous solids framework (such us tunneling states, weak interference effects, variable range hopping, or spin glass) in order to explain certain physical properties observed in QCs. On the other hand, the absence of a general, full-fledged theory of quasiperiodic systems certainly makes it difficult to clearly distinguish the features related to short-range order atomic arrangements from those stemming from long-range order correlations. The contributions collected in this book aim at gaining a deeper understanding on the relationship between the underlying structural order and the resulting physical properties in several illustrative aperiodic systems, including the border line between QCs and related complex metallic alloys, hierarchical superlattices, electrical transmission lines, nucleic acid sequences, photonic quasicrystals, and optical devices based on aperiodic order designs.

nucleic acids --- aperiodic --- quasiperiodic --- fractal --- order --- disorder --- energy structure --- charge transport --- Mg-Zn-Gd alloys --- symmetrical rod phase --- quasicrystal --- morphologies and properties --- quasiperiodic order --- self-similarity --- quasiperiodic photonic micro/nanostructures --- fractal-like photonic micro/nanostructures --- quasiperiodic or fractal-like plasmonic structures --- non-periodic systems --- localization properties --- electrical transmission lines --- quasiperiodicity --- localization --- tight-binding model --- Kubo formula --- low-dimensional systems --- n/a