The conscious experience of being a subject arises when a single organism learns to enslave itself.

Dolphins frequently leap above the water surface. One reason for this behaviour could be that, when travelling longer distances, jumping can save the dolphins energy as there is less friction while in the air.

For a human being, to possess a consciously experienced first-person perspective means to have acquired a very specific functional profile and distinctive level of representational content in one's currently active phenomenal self-model: It has, episodically, become a dynamic inner model of a knowing self.

Subjectivity means to catch yourself in the act.

A lot of evidence shows that most of our cognitive processing is unconscious - phenomenal experience is just a very small slice or partition of a much larger space in which mental processing takes place.

Speaking as a phenomenologist, it seems to me that a considerable portion of mind wandering actually is "mental avoidance behaviour", an attempt to cope with adverse internal stimuli or to protect oneself from a deeper processing of information that threatens self-esteem.

All attention is introspection.