The document compares and contrasts life in a small town, medium-sized city, and large city. It notes that the small town of Santiponce has a very small population of around 8,500 people, little traffic, and people mainly live in houses. In contrast, the medium-sized city of Seville has a much larger population of around 700,000, more traffic, and people live mainly in flats. The large city of London is described as very big and noisy with almost 9 million residents and a mix of flats and houses but too much traffic.