This tower was built for the 1889 [Paris#LUGARES#2] exhibition and was the result of the ample technical and aesthetical knowledge that had been accumulated over the 19th century. A specialized team did more than 20,000 sketches for its design. At first many believed that such a design was unfeasible but in the end Eiffel's studio technicians demonstrated that it was in fact possible to build a tower 984 ft (over 300m) high. It was not designed with a specific function in mind but rather to illustrate technical and industrial advances. However, it was later used as a communications tower. Its tall spire did not point to Heaven, like those of the ancient cathedrals, but rather to the promises of secular and republican progress that characterised 19th century positivism.