In the novel "My Sister's Keeper" by Jodi Picoult, the imagery of communication as a luminous grammar reflects the complexity of emotions and relationships. The phrase illustrates how certain feelings may be challenging to articulate, suggesting that written symbols can convey deep sentiments that spoken words sometimes cannot.

This idea emphasizes the power of written language, where punctuation like parentheses and exclamation points not only serve a grammatical function but also represent the nuances of human experience. The glowing imagery creates a striking visual that highlights the importance of expressing difficult emotions in a tangible way.