- MECHANICAL: It has its roots in the Industrial Revolution. Form is a direct and mechanical consequence of the functions to which it is linked. Beauty comes automatically from the most perfect mechanical efficiency and not from a deliberate search for beauty.
- ORGANIC: The form takes on a biological sense and adapts itself to the living functions which must be carried out in the environment (architecture), that is, adapted to human activities and the social environment. That which develops from inside to outside in harmony with human activities. And that which relates to the place as if it was born from there.
- MORALISTIC: Forms must be exactly what they appear to be. A building should be a faithful expression of its purpose and of its time. Structural materials and systems should be used with integrity and should express themselves honestly. The moral analogy also implies that practicality is a virtue in architecture, so useless ornamental forms should be rejected.