The persistence of this imagery calls to mind what Ludwik Fleck termed 'the self-contained' nature of scientific thought. As he described it, 'the interaction between what is already known, what remains to be learned, and those who are to apprehend it, go to ensure harmony within the system. But at the same time they also preserve the harmony of illusions, which is quite secure within the confines of a given thought style.

Emily Martin