Greek philosopher. He pointed out several paradoxes that raised modern problems of space and time. For example, motion is an illusion, since an arrow in flight must occupy a determinate space at each instant, and therefore must be at rest.
The quetzal, the national bird of Guatemala, symbolizes freedom. The blue bands stand for the Caribbean Sea and the Pacific Ocean. The weapons represent the defence of liberty. Effective date: 15 September 1968.