The two purposes of this article are: 1) to use metaphorical analysis to determine whether or not Max Planck invented the quantum postulate and 2) to demonstrate how metaphorical analysis can be used to analyze the rhetoric of revolutionary texts in science. Metaphors often serve as the basis of invention for scientific theories. When we identify these metaphors in Planck's original 1900 quantum paper, it is clear that Planck did consider the quantum postulate to be important. However, we also see that he does not consider the quantum postulate to be revolutionary.

Examining the history of science from the perspective of metaphor suggests that there are few differences between the literal and the metaphorical in scientific discourse. The central role of metaphors in science seems to ensure that science is open-ended, suggesting that conceptions of reality will always be open to change and interpretation.