What is the importance of the "blue chair" in the memoir, Aftershocks?

The day after Anabel told Nadia her father died of AIDS, not cancer, Nadia wandered Manhattan endlessly. Eight hours later, she discovered a blue chair just six blocks from her apartment. Something about it, particularly its rocking capabilities, reminded her of her father. She wrangled the chair back to her place, and into her room. Depressed and distraught, over the next week, Nadia did not move from the chair. She barely consumed anything but alcohol. The chair was the only place that felt nominally like home. On the eighth day, Nadia finally moved from the seat, and began rediscovering her life and world. The blue chair is also a structural and temporal marker throughout the memoir.