The Greeks had many opportunities to exchange ideas because of their extensive trading network. Much of Greece is comprised of islands and coastal cities, so the Greeks learned the value of sailing and navigating early on in the development of their civilization. The Greeks traded with many different cities and civilizations around the Mediterranean Sea, all the way from Persia to North Africa, even to Spain and France. Some trade routes even went as far as the Indus River Valley. As the Greeks pushed their trading routes even farther east, they were exposed to even more different artistic styles, techniques, and luxury items.
Whenever the Greeks traveled and traded, they also ended up exchanging language, customs, technology, writing in addition to the goods they bartered.