“Energy Structures is the fourth and final issue in our ”Art of the Built Environment” series. To consider energy structures is to acknowledge the enormous infrastructures that capture and distribute electrical energy as well as to measure the endurance and exhaustion of the human body. The history of civilization’s advancements can be told through the development of methods for extracting energy from natural resources. To meet the consumption requirements of the tools we build or to fuel the efforts of our own bodies—for better or worse—human endeavors always traffic in the exchange of energy.“ Letter from the Editor Sarah Higgins…