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Many ancient philosophers debated about their understanding of the world. Some of them thought that the world had been either undergone constant changed or remain unchanged. In Heraclitusf view of the world, everything is always in constant state of change. Our sensory perceptions must be unreliable. The conclusion was base on@his own perceptions. He is one of the first philosopher to have this intrepid thinking of the world. But on the other hand, Parmenides, despite his observation of the world, he thought nothing could be changed. Our sensory perceptions are reliable. eEverything changesf. This is Heraclitusf fundamental understanding of the world. Though his eyes, he saw the changing world; wind blowing, fire burning, water flowingcetc are all the display of changing, and the characteristic of water. eeYou can not step twice into the same