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.
In 2011 the unitÃ© urbaine had a population of 10,516,110. The Paris Region, or Ãle-de-France covers 12,012 square kilometers (4,638 square miles), and has its own regional council and president. It has a population of 12,005,077 as of January 2014, or 18.2 percent of the population of France.