All realities are virtual, and any can be the base reality depending on where a consciousness begins and how expansive its outward awareness becomes. Each reality can be defined and described independently from within by its inhabitants with their languages. Realities of which I am aware have dimensions, inhabitants, information transfer rulesets, and entropy. When we are conscious of more than one reality, we can start to build a common lexicon for describing realities as we compare and contrast their properties, attributes, qualities, characteristics, parameters, limitations, phenomena. Some pairs of realities may appear to form dichotomies when compared.
Around the turn of the 20th century, psychotherapists began to sort phenomena of the mind into the conscious and the unconscious. To Freud and his pupils, the conscious mind (Bewusstein) is home to the thoughts, feelings, memories, and desires of which we are aware at any given moment. In the unconscious mind (Unbewusstein) resides the (often unpleasant) thoughts, feelings, memories, and desires of which we are not presently aware. When a conscious being turns its attention inward, it witnesses certain thoughts, feelings, memories, and desires Jung's collective unconscious (kollektives Unbewusstes) underpins and surrounds the unconscious mind with instincts and archetypes like those Joseph Campbell expounded in The Hero with A Thousand Faces.
Some experiences are difficult to share.
From Westworld, Season 2, Episode 1: Dolores: "What is real?" Bernard: "That which is irreplaceable."