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.
The Paris unitÃ© urbaine is a measure of Paris' continuous urban area for statistical purposes, including both the commune and its suburbs, and has a population of 10,601,122 (Jan. 2013 census) which makes it the largest in the European Union.