/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: ClarePassfield https://cdn.slidesharecdn.com/profile-photo-ClarePassfield-48x48.jpg?cb=1523006747 ..ears do not sense sound, just silent pressure waves which converts to electrical signals. Where is the sound? Your eyes don't see material objects. They sense invisible photons. Your brain receives these as electricity. Where is the world?