In the universe of architecture and construction methods, the plumb line is an essential instrument that defines the verticality and balance of a house or building; at the same time, it gives us security and certainty in the face of the randomness that can result from the life of a poorly constructed building. We start from the assumption that the mason’s plumb line is never wrong and always augurs a stable roof, a firm construction. Hence this aerial city, shaped by its primordial instrument, worthy of bringing forth a Ciudad Plomada/ Plumbed Citygraceful and ethereal. A city that also owes its power and security to its active counterpart, in this case, another city more terrestrial, industrial and heavy than the one that supports it. A city where counterweights and balances seek not only to prevent the fall and collapse of Ciudad Plomada/ Plumbed Citybut also to provide a unique service: to be the B-side or the dark side of the airy and useful beauty of these golden buildings that, with their promising light, outline for us a faithful future to the perfect utopia. Let Counterweight (Plumbed City) be that new portal that augurs the encounter with any lost paradise.