It is well established that perception is not a reliable copy of the external world, but only part of it composed by external stimuli, while the rest is constructed by the brain. This means, that the brain creates only the reality it is interested in for the survival of the organism. This means that Reality in capitals, the ontological reality, as philosophers call it, does not exist. Constructivism, the philosophical movement that is closest to the results of modern neuroscience, suggests that we do not construct reality objectively, but we subjectively invent it. Constructivism in reality is thus about deconstructing our confidence in the objectivity of the world that surrounds us.