Immanuel Kant, who revolutionized the philosophy of his time, famously wrote that his was a Copernican Revolution. Just as Copernicus had radically revised the then existent picture of our universe, pointing out that the sun, not the earth, was the center of things, that we revolved around it rather than vice versa, so Kant believed his approach to philosophy radically refashioned how it would be done henceforth. And on the evidence, he was right. Kant moved philosophy from the metaphysical project of trying to describe the world comprehensively, in all its aspects—by applying our epistemic capacities to things beyond our empirical reach—to describing what we can think and know about what is the case and limning the rest indirectly, by sketching out what must also be the case if we are to know anything at all.
This is no less metaphysical than our efforts to talk about what lies beyond our intellectual reach, of course, but it isn’t subject to the inherent error of attempting to describe what is, in its nature, necessarily indescribable. Hence Kant concluded his efforts were of a "transcendental" nature, his metaphysics understandable as a transcendental sort albeit without assuring us of the same level of epistemic result we expect from knowledge obtained through the senses, from information garnered about things that can be seen or felt, etc. After Kant philosophy turned much of its attention to the parameters of knowledge itself. Kant, himself, sought to explain the seeming reality of things, and our capacity to know that reality, by explaining how this world is ultimately just a product of our human minds. We are, he reasoned, in possession of certain mental equipment which gives form to the bombardment of information we receive on an ongoing basis, shaping it through a kind of built-in lens into a world of things we see and feel, hear, smell and taste, the sensory data impinging on us being shaped, as it were, into knowable phenomena, things we can identify as such and so speak about. Our sensory organs, he reasoned, in tandem with the shaping capacities inherent in our minds, make of the raw data something shaped and structured, yielding objects for our attention where, before, all was disparate and unconnected, unformed, amorphous.
But we cannot, he thought, know the structures within which knowledge as such takes shape in the same way we know the things shaped. . . . .
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