Echo

Echo is a phenomenon in acoustics where sound waves are reflected off surfaces and heard again. Scientifically, it occurs when sound bounces off a hard surface and returns to the listener after a delay. Echoes can be simple, repeating the original sound once, or complex, with multiple repetitions and variations in pitch and volume. Notable echoes include the famous one in Villebertain’s avenue near Troyes, which repeats a twelve-syllable verse twice, and the unique echo in Glasgow, Scotland, which repeats trumpet sounds an octave lower up to three times with brief silences. Historically, echoes have been the subject of folklore and myth, often attributed to spirits or supernatural entities repeating sounds.