If it is true, as claimed by Germanus of Constantinople in his "Historia Ecclesiastica", that "the church is heaven on earth, in which the God who is above the heavens dwells and walks", it is easy to understand how complex it is to design and build a church, thinking of it starting from the community and the people who will use it, from the city that will welcome it, from the neighbourhood that will be transformed thanks to a place of worship that will mark, modify and offer opportunities for dialogue and encounters between people. The architecture of places of worship (both ex novo and the adaptation of existing buildings) requires the observance of precise design criteria in relation to the urban context and of technical, lighting and dimensional criteria referring to the different parts that make up the building.