Characters
The magic chose the shape, not I. I am a bearer, I am a dwelling, I am a messenger.
— Schmendrick · The Last Unicorn

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker gives magic responsibility for choosing a shape and describes the self as its carrier, dwelling and messenger. Agency is placed elsewhere. The three images present a role of receiving and conveying something, rather than claiming complete authorship or control over its form.
Context reviewed