Narcissus (mythology) is the story of Echo and Narcissus. One day Narcissus was walking in the woods when Echo, an Oread (mountain nymph) saw him, fell deeply in love, and followed him. Narcissus sensed he was being followed and shouted "Who's there?". Echo repeated "Who's there?" She eventually revealed her identity and attempted to embrace him. He stepped away and told her to leave him alone. She was heartbroken and spent the rest of her life in lonely glens until nothing but an echo sound remained of her. Nemesis (as an aspect of Aphrodite), the goddess of revenge, noticed this behaviour after
Echo Greek is a mountain nymph whose ability to speak was cursed, only able to repeat the last words anyone spoke to her. Some animals use echo for location sensing and navigation, such as cetaceans (dolphins and whales) and bats. Acoustic waves are reflected by walls or other hard surfaces, such as mountains and privacy fences. The reason of reflection may be explained as a discontinuity in the propagation medium. This can be heard when the reflection returns with sufficient magnitude and delay to be perceived distinctly. When sound, or the echo itself, is reflected multiple times from multiple surfaces, the