Books
The handpiece lay detached from its catch, waiting for Franny. It looked almost as dependent as a human being for some acknowledgment of its existence.
— J.D. Salinger · Franny and Zooey

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The detached handpiece is described as though it were waiting for attention from Franny. Comparing it with a dependent human being gives an ordinary object an emotional need. The image makes the act of acknowledging its existence seem unexpectedly personal, turning a simple detail into a quietly poignant one.
Context reviewed