Or like listening to a description of a song. The speaker might tell you the lyrics, even hum the various parts. If the song is simple (corresponding to perhaps

Or like listening to a description of a song. The speaker might tell you the lyrics, even hum the various parts. If the song is simple (corresponding to perhaps simple and interesting facts about our solar system), vocals will give a good rendition of it. But if the song is intricate (like quantum mechanics), without the full band, all you are listening to is a hollow echo of the song.