It was a world sphere (globe), with a diameter of 2 meters, constructed by Crates of Mallus and exhibited in Pergamon in ca 150 B.C. It was divided into five parallel zones, two frigid, two temperate and one torrid (which are still used today). Frigid zones, due to extreme cold, and the Equator, due to excessive heat, were detrimental to the development of human life. Climatic seasons in the northern hemisphere were reversed to those in the south. On the globe, he designed the well-known regions of Asia, Africa and Europe which he named “Oecumene” using parallels and meridians centered on the island of Rhodes and using a variety of geographical coordinates of numerous places, mountains and rivers. To balance Oecumene over the huge water surface that remained, he considered that an unknown continent, the “Perioeci”, would exist in the opposite northern hemisphere (today corresponding to North America) and two more unknown continents would exist in the southern hemisphere, the Antipodes” (today corresponding to South America) and the “Antioeci” (today correspond to Australia). He claimed that the temperate regions of these unknown continents were inhabited, and even the people who lived near the equator he said would have Negroid characteristics and called them Anti-Ethiopians opposing to the well-known Ethiopians.