only two things manifest, light and sound both are frequencies. this is a dualistic reality as ancient text books document such as Hindu and Buddisht history. ancient philosophy digs into "reality" also such as Kant, Discarte, Hume, Walter Russell to name some. It was only in modern times, that we have gone away from these ancient teachings when the "Western" world became industrial I believe. and since then we have been in a huge trance matrix of disinformation about who we are and what reality is.