These short lessons try to make us understand accurately some of the origins that give place to what is commonly described as Modern Architecture. Far from any dogma or formal approach, they let us dive into its essence through some ideas still stirring todayÕs panorama of the discipline. Ideas that are not new, despite their contemporary features, but come up from a long line of events we can identify in past centuries. Based on four main bodies of general knowledge (approaches, emotions, ideas, and marketing), this text spans from the Enlightenment revolution times to the dusk of the influence of the Modern Movement, focusing on concepts and authors who represent this evolution through their proposals.