The anthology titled "Spacetime Energy: A Twenty First Century Perspective" encompasses novel and avant garde ideas that delineate the intrinsic nature of spacetime and several of its aspects. The collection of papers epitomises the fundamental aspects of the physical world. For instance, the authors have considered the affine connection between gravitation and electromagnetism. The non-commutative nature of spacetime has also been elaborated in connection with gravitation and electromagnetism and also in terms of monopoles. On the other hand, the rudimentary nature of the zero point field or the field of the vacuum has also been considered to describe the 2-state asymmetries that are found in nature. Several interesting models have been considered to get a novel perspective on the nature of the universe we live in; the importance of dark energy has been implied therein. The authors have also considered the phenomenon of photoelectric effect in case of grapheme and other similar crystals. A new formula has also been found for the conductance in case of carbon nano tubes. Ultra-high energy fermionic behaviour has been elaborately discussed from a novel perspective and the anomalous gyromagnetic ratio of the electron has also been elucidated on the pedestal of the noncommutative nature of spacetime. Resorting to an altogether different approach, the nature of symmetry breaking and the details related to the relevant Lie algebras has also been discussed. Essentially, the collection of works provides a broad range of conceptual understanding of the universe, both in the macroscopic and the microscopic scale. Nevertheless, the reader should find the works to broaden their view of the physical world that exists around us.