Vast amounts of critique, plaudits, queries and aspersions have been leveled at Thomas Kuhn's Structure of Scientific Revolutions in the 51 years since it was first published. While I am sure there is little novel (or, frankly, of interest) that I could add to the discussion, I wanted to highlight one aspect of the work which seems generally overlooked. Though SSR is the intricately tied together and carefully written this aspect is surely addressed in reference to many of its other salient points, what struck me was the notion of incommensurability and perception.
When Kuhn writes (paraphrasing) that each scientific revolution transformed the scientific imagination in ways ultimately resembling a transformation of the world, he is speaking volumes indeed. Seeing something new, for the first time, is, for Kuhn, a discovery not only of what something is, but, moreover, that something is. Our conception of science and the universe will always impinge upon our sense of what is possible. Thus, it is not to say that Aristotle was a primitive Newtonian, or that Einstein could have imagined quantum theory - each time period is dealing with a context so distinct, that they can be meaningfully said to inhabit different realities. The implications of this, and the role that perception and theory play upon both our science and our place in reality, are far-reaching.
As such, science can be said to evolve, just like nature. Issues of emergence, fitness, and phase change are just as real in science-as-subject, as they are in science-as-method. What this evolution says about the substance of science - about the phenomena that science can possibly know - is surely a pressing concept for the field of science studies. All around us science (and scientific endeavor) expands, seemingly without limit. Yet, any case must choose what to prize and what to marginalize; all manner of looking must be exclusionary. The development of our scientific understanding has yielded so much; we must remember to not lose sight of that which it would deem insignificant, or, worse, non-existent.