The design of the Eiffel Tower was the product of Maurice Koechlin and Emile Nouguier, two senior engineers working for the Compagnie des Etablissements Eiffel, after discussion about a suitable centrepiece for the proposed 1889 Exposition Universelle, a world's fair to celebrate the centennial of the French Revolution. Eiffel openly acknowledged that inspiration for a tower came from the Latting Observatory built in New York City in 1853. In May 1884, working at home, Koechlin made a sketch of their idea, described by him as "a great pylon, consisting of four lattice girders standing apart at the base and coming together at the top, joined together by metal trusses at regular intervals". Eiffel initially showed little enthusiasm, but he did approve further study, and the two engineers then asked Stephen Sauvestre, the head of company's architectural department, to contribute to the design. Sauvestre added decorative arches to the base of the tower, a glass pavilion to the first level, and other embellishments.

What was the reason for the eiffel tower? Let's have some stream of consciousness first.
To answer this question, we should know that: The design of the Eiffel Tower was the product of Maurice Koechlin and Emile Nouguier, two senior engineers working for the Compagnie des Etablissements Eiffel, after discussion about a suitable centrepiece for the proposed 1889 Exposition Universelle, a world's fair to celebrate the centennial of the French Revolution. So, the answer is a suitable centrepiece for the proposed 1889 Exposition Universelle , a world 's fair to celebrate the centennial of the French Revolution.