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 city state of Berlin is located in the Northern European Lowlands (North German Plain) along the Spree river in eastern Germany. It lies within the state of Brandenburg. Germany's capital city (again since 1990), has an area of 892 kmÂ² (344 sq mi) and it is, with a population of 3,4 million inhabitants, Germany's largest city.