The Language of Invisible Vibrations - Hazrat Inayat Khan

Color and sound are not only the language in which one
communicates with the life without, but also the language in
which one communicates with the life within.  One might ask
how it is done.  We can see the answer in certain scientific
experiments.  Special plates are made, and by speaking near
such a plate marks are made upon the plate with sound and
vibrations.  Those marks make either harmonious or in-
harmonious forms.  If that is true, then every person, from
 morning till evening, is making invisible forms in space by
what he says. He is creating invisible vibrations around him
 and so he is  producing an atmosphere.  Therefore it is that
 one person who may come into the house, and before he speaks
you are tired of him, you wish to get rid of him.  Before he
 has said or done anything you are finished with him, you would
 like him to go away, for in his atmosphere he is creating a sound;
 a sound is going on which is disagreeable.  There is another person
 with whom you feel sympathy, to whom you feel drawn, whose
friendship you value, whose presence you long for; harmony
is continually created through him.  That is sound too.

If that is true then it is not only the external signs, but also the
inner condition which is audible and visible.  Though not visible
to the eyes and not audible to the ears, yet it is audible and
visible in the soul.  We say: "I feel his vibrations.  I feel the person's
presence.  I feel sympathy, or antipathy towards that person."
There is a feeling, and a person creates a feeling without having
said anything or done anything.  What you are speaks louder than
what you say.  "It is life itself which has its tone, its color, its vibration.
It speaks aloud."

Hazrat Inayat Khan
Vol. 2, The Mysticism of Sound and Music
7. The Spiritual Significance of Color and Sound

with thanks to Whiskey River

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Photo - Mystic Meandering