What is the main purpose of the lecture? Why does the professor mention that the arches of the Eiffel Tower resemble railway br

Listen to part of a lecture in an architecture class.
    Professor:
    The Eiffel Tower in Paris is one of the world’s most famous architectural landmarks. It’s been part of the Parisian landscape since its completion in 1889. And it’s so connected to the city that it’s hard to imagine the time when the tower wasn’t there. Think of all the photographs and paintings, urn, of all the images of the tower in movies. And you’ll be forgiven if you thought the Eiffel Tower has always been admired by artists. But if we look at a little closer to the history of the tower, you’ll see that this wasn’t always the case.
    The Eiffel Tower was built for the Universal Exposition of 1889, a world’s fair that presented the latest developments in science, technology, commerce, culture and industry. It was designed by an engineer named Gustav Eiffel, who entered and won the competition sponsored by the exposition organizers to design a structure that would serve both as an entrance to the exposition and as a visible symbol of French industrial and technological advancements.
    But for almost the moment the tower was announced as the winner of the competition, and even as it was being constructed, critics began to speak out against it.
    Why? Well, let’s look at the tower. First, there is its height. At 300 meters it was the tallest building in the world, let alone in Paris. Critics, many of them, the best-known composers, architects, painters, poets and writers of the time, they called it an eyesore, one that unfortunately could be seen from anywhere in the city.
    And aside from its height, there was the unprecedented nature of the design. Four huge legs rested on a concrete foundation. Standby arches resembled railway bridges. Its iron structure was boldly exposed rather than covered up with masonry as was the norm. It looks almost industrial, doesn’t it? More like part of a factory than an example of great architecture you want to showcase to the world. The tower was a radical departure from the Beaux-Arts style of architecture that was popular at the time. Beaux-Arts architecture was heavily influenced by the architecture of classical Greek and Roman buildings. For example, it featured grand columns of entrances, arched windows and doors, and sculpted the ornamental details. And it was the preferred style of all the famous French architects. In short, it was everything that the Eiffel Tower wasn’t. So, given this context, the position of the critics wasn’t all that unreasonable.
    Now as I alluded to earlier, while it was under construction, a group of famous artists and architects bitterly protested the tower by filling newspapers with letters and editorials against it. For the art establishment, the tower violated the very principles of artistic taste and have no place in Paris.
    But as it happens, opinions changed. Um, let’s skip ahead a couple of decades, shall we? In the 1910s, a new generation of artists appeared in cities across Europe. These young artists enthusiastically embraced the innovations that were accelerating the rhythms of modern life. Innovations like cars and airplanes, telephones, movies, radio. And as part of this trend, they wanted to forget or destroy everything that was old. The Eiffel Tower’s shocking newness of form that owed nothing to ancient traditions, its almost machinelike appearance, everything that had so upset the art establishment back in the 1880s was embraced by these artists.
    Indeed, the tower became a source of inspiration for many young artists. One such artist was Robert Delaunay. Robert Delaunay began painting the Eiffel Tower in 1909 and remained pretty much obsessed with it for the next two years, producing about 30 versions of the same subject. And now it looks like we were out of time here. But. for next time look at some of Delaunay’s paintings in your book, especially at the one called The Eiffel Tower. You’ll notice right away that the Eiffel Tower doesn’t look much like the paintings we’ve studied so far. It’s painted in the Cubist style. So you’ll see the traditional perspective give way to multiple views of dynamic angular lines. The tower seems to be expanding, contracting, crumbling, twisting before the viewer’s eyes. And take note especially of those puffy clouds above and behind the tower. See if they look like an explosion to you. This image signals a rupture with traditional painting style, just as abrupt as the Eiffel Tower’s original rupture was from the Beaux-Arts style in architecture.