The passive approach to the themes of energy savings is essentially based on the morphologic articulations of the constructions. The experience of Studio Nicoletti in low energy building is exemplified by five groups of designs based on different typologies. Cool air stored in the heart of buildings. Tall buildings: energy savings based on minimization of the structural materials and bioclimatic systems. Double skin for cooling the external envelope of the buildings. Urban climate: climatization of large urban fragments, protected either by a glass envelope or a bioclimatic pergola. Integration of various methods including extensive use of natural lighting, like in the design for the New Acropolis Museum in Athens.