Why was architecture considered a "social art" during the renaissance?

Leon Alberti  was a Italian Renaissance Architect who described architecture as a "social art," (meant to blend beauty with utility and improvement of society).

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based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.