In Huxley’s work, an altered state of consciousness refers to a temporary reorganization of perception that loosens the brain’s usual filtering mechanisms, allowing sensory, emotional, and experiential qualities that everyday awareness normally suppresses to become more vivid. Such states may arise through chemical, psychological, or ritual means and may arise through encounters with dimensions of perception that coexist with, but are typically hidden by, practical consciousness. This state reveals alternative ways that the mind can structure experience, often intensifying color, form, spatial awareness, and emotional response. Huxley treats altered consciousness as evidence that ordinary perception is selective rather than complete, showing that awareness can operate according to different priorities when freed from constraints.

Antipodes are the regions of the mind (and the visual components of these regions) that are accessible through altered states of consciousness. Huxley suggests that the beauty and radiance that appear in art and architecture come from antipodes.

The way language and abstract ideas shape how humans perceive the world is conceptual mediation/awareness. Huxley argues that while concepts are useful, they can also create distance between us and direct experience. They sort what humans see into familiar categories, which makes reality easier to handle but less immediate.