The amount of printed material and its readership began to increase after the invention of moveable type in Europe in the 1450s. As explained by writer and editor Lynne Truss, "The rise of printing in the 14th and 15th centuries meant that a standard system of punctuation was urgently required." Printed books, whose letters were uniform, could be read much more rapidly than manuscripts. Rapid reading, or reading aloud, did not allow time to analyze sentence structures. This increased speed led to the greater use and finally standardization of punctuation, which showed the relationships of words with each other: where one sentence ends and another begins, for example.