Annoyed at having first to turn his pullovers the right side out every time he puts them on, he decides to turn them around as soon as he has taken them off. Surely, this is rational. But since this decision does not override the decision automatically to turn out his pullover when he puts it on, he unfailingly ends up with it the wrong side out. A dilemma: how is one to rationalize an act without disturbing one's automatic behaviour? And things are even worse if, faced with this failure, one resolves to give up the innovation, since the old practice is then immediately disrupted too, being no longer spontaneous and infallible. The situation created is a hopeless tangle. The lesson of all this: all clothing should be reversible. Ideas, too, so that one could slip into them from any side.