What is art?
 Art is difficult to define, it's elusive. It's some kind of a metaphysical phenomenon. According to Sir Herbert Eduard Read art is measurable,  because it has rhythmic and expressive elements. Art is related to our senses and deeply involved in the process of perception and thought. Even though it is an abstract phenomen ,there's something common to all works of art and that's "form", which means to take shape. A good form of art has a touchstone or a reference point. One of them is nature, the whole process of life. What we should keep in mind in order to create a good form of art is that order without diversity can cause  monotony, but diversity without order can cause chaos. Which leads to conclusion that art is an attempt to create pleasing forms.On the other hand beauty is relative, so art isn't supposed to be beautiful it's supposed to make you feel something.
Architecture
While talking about forms we leap to architecture. Thomas Graham Jackson used to say that architecture is nothing but ornament added to building. In here we debate and object his statement , because architecture's point it's not to beautifulying buildings, but in buildings beautifully. It's often considered as science by Vitruvius and also as the poetry of construction. Architecture is mostly related to space. It can never be an ornament, it's a significant element in buildings beautifully. A new term "Fabrica et ratiocinato" which means knowledge of practical building and  application the reto of reasoning , leads us to the conclusion that practice needs theory.