"For years I have been mourning and not for my dead, it is for this boy for whatever corner in my heart died when his childhood slid out of my arms"

In this quote, William Gibson expresses a deep sense of loss and grief that he has actually been bring for many years. However, it is not for a departed loved one, however rather for a boy who has matured and left his childhood behind. This kid holds an unique location in Gibson's heart, and his departure has triggered a part of Gibson's heart to pass away. This could represent completion of innocence and the death of time. Gibson's grieving is not just for the young boy, but also for the loss of a precious and irreplaceable part of himself.