I don’t need to clasp the harmonica with my mouth, but to kiss it. And the pressure of my lips against the harmonica, they dictate the depth and veracity of my kiss. Respectively, the hand serves as the other person. No. That’s not it. The hand provides the pressure for the harmonica.
The HARMONICA is the other person, so that is to say that the harmonica is kissing you back. And the amount of pressure by which the harmonica kisses you back likewise determines the measure of the kiss.
So then perhaps I only need to be kissed by the harmonica.
And all that fills in the space thereafter. As far as I can estimate that is where they were driving when it was first said:
Let not thy left hand know what thy right hand doeth.
In modern days, phrases such as “he doesn’t know his left hand from his right” is meant to be someone who is incompetent. Useless. Without purpose. To me it’s jazz, man. Best perhaps then it remain a secret. Careless people go unnoticed. More time to enjoy the dance.