Perceiving reality is the action of consciousness via the senses. We perceive reality independent of ourselves by our senses. To form it, we must physically interact with it. We can form a snowball with snow by using our hands. We can observe the snow, and think about snowballs, but they will not materialize without physically picking up the snow and shaping it into a snowball. Our power over the physical world is directed by our consciousness via actions that directly physically interact with reality. In this sense we can induce the Objectivist principle that existence has primacy over consciousness - or the 'primacy of existence principle' as it is formally referred to.
Leonard Peikoff uses the following examples to illustrate this in OPAR:
Existence is unaffected by consciousness when only consciousness is used in and of itself. It is when consciousness volitionally directs the actions of the physical being in which it is present that reality can be affected.
answered Mar 07 '11 at 18:30
We know that reality is independent of consciousness because wishing something doesn't make it so.
That so many people deny this obvious and basic fact about life is hard to fathom, but it isn't an iota of evidence that reality is dependent on consciousness.
Our minds do not create reality; our minds observe it. And anyone who disagrees is either profoundly dishonest, or profoundly confused by someone who has been dishonest.
answered Jul 11 '12 at 12:20
John Paquette ♦