This analysis was inspired by the idea, expressed by the scholars (E. L. Boullee, Cl. N. Ledoux, J. Ruskin) that “no one can be an architect, as he isn”t a painter”. To make clear what is the reason that makes these arts dependent and why visual arts have priority and necessity in architecture, a survey of the historic relations of these arts is made. The analysis incorporates the ideas, opinions and insights of scientists on the connections of architecture and visual arts. There drawing appears as the connector and even the background for these arts. Alberti affirms that an architect must adopt from a painter the competence to perceive and represent reality (“lines of perception”), which in architecture can appear as the creation of new re...