Yes, there is an outside world, and yes, there is an objective reality, but in moving through this world, we constantly apply unconscious filter mechanisms, and in doing so, we unknowingly construct our own individual world, which is our "reality tunnel.
Thomas Metzinger, The Ego Tunnel: The Science of the Mind and the Myth of the Self
consciousness, dreams, existentialism, neuroscience, reality, subjectivity, thomas-metzinger, unconsciousness