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 the largest city and capital of France. The City of Paris has just 40 square miles of land with a population of 2.24 million in the city limits, and the most populous urban area in all of the European Union. The city proper has a density of over 21,000 people per square kilometer. The much larger Paris Region, with 4,638 square miles of land, has its own president and regional council with a population of 12 million. This accounts for 18% of France's total population.