“Echoes” is a term that refers to the reflection of sound waves off surfaces, creating a repeated sound. This phenomenon occurs when sound travels through a medium, such as air, and bounces back after hitting a solid object. The time delay between the original sound and the echo can vary based on the distance to the reflecting surface. In addition to its scientific meaning, “Echoes” is also the title of a popular album by the band Pink Floyd. Released in 1971, the album features a blend of progressive rock and experimental sounds, showcasing the band's innovative approach to music.