Gifford presents some interesting observations about time and its relationship to the entire developmental life cycle. In various states of deprivation, such as imprisonment or isolation with sensory deprivation, whether experimental or enforced, time seems to pass much more rapidly than otherwise. The author's most interesting point is that "Freud's dual-instinct theory is both a biological and a developmental one that can be extended to include both ends of our life-span—from the timeless undifferentiated state of the infant at his mother's breast to the abridgement of time in old age and the timelessness of coma and death." He claims this as confirmation that "the aim of all life is death."