Niklas Luhmann used cybernetics to challenge the role of foundational unities and canonical certainties. The three Aristotelian unities of drama are the unities of time, place and action. For example, verisimilitude limits of the unities. It demanded decorum and rigorous adherence to the classical unities. The play maintains Aristotle's six elements of a tragedy in addition to the three unities. The monophyly of these unities appears to be weakly justified. The plot respects the classical unities of time, space and action. Inhering in the parts giving them really distinct unities are the accidental forms. He insisted on the observance of the dramatic unities. He will have nothing of criticising it in terms of the classical "unities". Racine observes the dramatic unities more closely than the Greek tragedians had done. The play has two acts and follows the convention of the classical unities. The Classical Unities seem to have had less impact in England. In 1655 he published his "Trois Discours", which includes his arguments for the unities. Some jurisdictions may require additional unities.