The small number of basic origami folds can be combined in a variety of ways to make intricate designs. The best-known origami model is the Japanese paper crane. In general, these designs begin with a square sheet of paper whose sides may be of different colors, prints, or patterns.
On 30 June 2017 the city-state of Berlin had a population of 3.69 million registered inhabitants in an area of 891.85 km 2 (344.35 sq mi). The city's population density was 4,048 inhabitants per km 2. Berlin is the second most populous city proper in the EU.
Paris is both a commune and department, and forms the centre and headquarters of the Ãle-de-France, or Paris Region, which has an area of 12,012 square kilometres (4,638 square miles) and a population in 2014 of 12,005,077, comprising 18.2 percent of the population of France.