V. The Activity of Knowing the World

Let me make myself even clearer through an example. If I throw a stone horizontally through the air, I see it in different places, one after another. I connect these places into a line in mathematics I learn to know different line forms, among them the parabola I know the parabola to be a line that arises when a point moves in a certain lawful way. When I investigate the conditions under which the thrown stone moves, I find that the line of its motion is identical with that which I know as a parabola. That the stone happens to move in a parabola is the result of the given conditions and follows necessarily from them. The form of the parabola belongs to the whole phenomenon just as much as everything else about it which comes into consideration. The spirit described above, who did not have to take the roundabout way of thinking, would not only be given a sum of sight sensations at different places, but also, unseparated from the phenomenon, the parabolic form of the trajectory, which we only then add to the phenomenon through thinking.