I don't know if you are serious or not - both are fine, but a thought, or a mental picture, arose from that.
There is a house, which has several rooms. In one of the rooms there is a person, who has for some unknown reasons decided that there is no such thing as a door, and who has spent all of his/her life in that room.
How can one find his/her way out of the room? One could say that just opening the door and walking out, but what if thoughts alter his/her perceptions, which makes him/her not able to see the door? Do the other rooms of that house exist?
One could always say that it is nonsense that our choices alter our perceptions, but one can even see it in everyday life; the perceptions of someone who is heavily occupied with his/her mind (or a cell phone) is able to observe or pick up a lot less phenomena of his/her surroundings, when compared to someone who has an ability to be able to be present (in the present moment) and/or in a so called flow state.
In my experience this work also in bigger scale. From early childhood we have been conditioned to view things, act and think in certain ways and it has a great effect on how we see, hear, sense and experience the reality. In my personal experience a human being is a very sophisticated and highly sensitive instrument and a receiver and there are a lot of reasons why with the majority most of the system has been turned off or has never been properly tuned or switched on.