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Finally every Greek town had a theatre. These were used for both public meetings as well as dramatic performances. These performances originated as religious ceremonies; they went on to assume their Classical status as the highest form of Greek culture by the 6th century BC (see Greek theatre). The theatre was usually set in a hillside outside the town, and had rows of tiered seating set in a semi-circle around the central performance area, the orchestra. Behind the orchestra was a low building called the skene, which served as a store-room, a dressing-room, and also as a backdrop to the action taking place in the orchestra. A number of Greek theatres survive almost intact, the best known being at Epidaurus.

Tourism is a major source of foreign exchange earnings. Although it is one of the country's most important industries, it has been slow to expand and suffers from poor infrastructure. With more than 14 million tourists visiting Greece in 2002, the tourist industry faced declining revenues, partly due to the strong drachma. Revenue from tourism exceeded $5.2 billion in 1998, having increased somewhat as Greek tourism benefited from problems in neighboring countries and an economic recovery in the European Union.

It is sometimes difficult to determine which ideas Pythagoras taught originally, as opposed to the ideas his followers later added. While he clearly attached great importance to geometry, classical Greek writers tended to cite Thales as the great pioneer of this science rather than Pythagoras. The later tradition of Pythagoras as the inventor of mathematics stems largely from the Roman period.

Anaximander offered up the theory of the apeiron in direct response to the earlier theory of Thales, who had claimed that the primary substance was water. Anaximander reasoned that water cannot embrace all of the opposites found in nature — for example, water can only be wet, never dry — and therefore, it can not be the one primary substance. Nor could any of the other candidates, so Anaximander postulated the apeiron as a substance that, although it could not be perceived directly, could explain the opposites he could clearly see around him.

Eastern Orthodox Christianity is the dominant religion in Greece. During the centuries of Ottoman domination, the Greek Orthodox Church preserved Greek language, values, and national identity and was an important rallying point in the struggle for independence. There is a Muslim minority concentrated in Thrace. Other religious communities in Greece include Catholics, Jews, Old Calendar Orthodox, Jehovah's Witnesses, Mormons, and Protestants.

Glimpsed through the practice of animal sacrifice are the traces of an older practice, which was abandoned by the increasingly civilized Greeks - that of human sacrifice. Indications for this remain in the mythology, and in comments ascribing to Orpheus teachings that forbade such practices.