The issue that vexed Kant was central to what 20th-century scholars called "the philosophy of mind ". The flowering of the natural sciences had led to an understanding of how data reaches the brain. Sunlight falling on an object is reflected from its surface in a way that maps the surface features (color, texture, etc.). The reflected light reaches the human eye, passes through the cornea, is focused by the lens onto the retina where it forms an image similar to that formed by light passing through a pinhole into a camera obscura . The retinal cells send impulses through the optic nerve and then they form a mapping in the brain of the visual features of the object. The interior mapping is not the exterior object, and our belief that there is a meaningful relationship between the object and the mapping in the brain depends on a chain of reasoning that is not fully grounded. But the uncertainty aroused by these considerations, by optical illusions, misperceptions, delusions, etc., are not the end of the problems.
Mike Huckabee told a Townhall columnist that he was “utterly stunned that Russell Moore is being paid by Southern Baptists to insult him.” He then proceeded to imply that Moore wasn’t committed to the “protection of the unborn, Biblical marriage, or helping people out of poverty,” when the most casual amount of research would show that Moore’s ERLC has been a leader in each of these issues. The ERLC is in fact one of America’s most-respected and eloquent voices for the unborn, for religious freedom, and against the radical and destructive expansion of the sexual revolution.
Things as they are "in themselves"—the thing in itself or das Ding an sich —are unknowable. For something to become an object of knowledge, it must be experienced, and experience is structured by the mind—both space and time being the forms of intuition, "Anschauung" in German, (for Kant, intuition is the process of sensing or the act of having a sensation)  or perception , and the unifying, structuring activity of concepts. These aspects of mind turn things-in-themselves into the world of experience. There is never passive observation or knowledge.