The revolving door is an ambiguous concept evoking strong opinions, and often is seen to lead to a decline in trust and legitimacy of the policy-making system of the Netherlands. But the different moral objections against the revolving door between functions and jobs in public and private organizations are barely matched with systematic empirical evidence of negative effects on the policy-making system. In this article, a definition of the concept is presented in order to help focusing the discussion on moral objections and practical implications of the revolving door. Two fundamental contradictions emerge from the panoply of arguments and assertions about this phenomenon. With our definition as a basis, we consider the different forms of the revolving door and discuss conditions under which it may be contained without solutions that are disproportionate to the problem. The way out is to develop clearer norms and integrity-enhancing mechanisms with which negative effects may be avoided and positive effects strengthened.