And so, you can actually, like, in an echo in sound, you can see the light moving outwards.

NPR: What Makes Our Solar System Special?

In their place, he says, an acoustic canopy should provide a louder and more even sound, with a shorter echo.

ECONOMIST: Time for a facelift | The

As a composer, Gress is interested in unifying the sound of an album by writing themes that echo or resonate off each other.

NPR: Summing Up Drew Gress' 'Irrational Numbers'

In addition to their show of splashing around the surface of the water, the humpbacks enchant visitors as their cries echo below the water, conducting a beautiful symphony for divers used to listening to just the sound of their own breathing.

BBC: Colombia��s prison turned paradise