According to Gaston Bachelard, the scientific character is constantly a consequence of a reform of the reason and the reality. Indeed, the imagination is necessary in this permanent confrontation of the experience with the reasoning. It is in the worry to make spring the new that is progressively separated truths that don't firmly hold. The déconstruction helps us to explain better this dialectics because, in this process, one doesn't stop to a simple opposition of facts; when déconstructing, one decides better while separating what invites less. The new openings whose science becomes tributary in terms of mutation, explanation and revolution constitute values then thanks to the ' logos', to the specific ‘allocutoire’ power of the science.