You could be able to guess personality of others from features. I think that Few things are as distinguishable and noticeable as face. The face is the true self visible to others. So I focus on shape of face. I think everything can be expressed through sound.
The blind man couldn't see me. I want to show my face trough sound.
I found that wave shape of sound is similar to shape of face in shape. It seems I am special. That is helpful to me.