Gaudí wanted to create a new architecture, with balanced, self-resistant structures. And so in his professional career he constructed parabolic and catenary arches and experimented with a reverse model of strings and bags for the church at Colonia Güell to calculate and construct inclined columns. For the expiatory church of La Sagrada Família, he proposed to improve the Gothic structure of the main European cathedrals and the project of the first architect of the church, and planned a balanced structure of columns that branch out like trees, as the culmination of the structural studies of his other buildings.