B Milligan

Care to elaborate on the essence of concepts, If it's not visible, what would it be?

In geometry class, when we draw a general triangle, we're bound to draw a triangle that's either right, or acute, or obtuse, but cannot draw general one.In that case, in what form does the general triangle exist?

Sure, when I inagine what a circle look like, my mind always provides me a circle as same as one drawn on paper, and the circle always has its specific diameter of 3cm or 4cm. Arrording to Kant's theory, the reason why a man can spot a circle is because he has got the scheme of it. I wonder if we can know what a general circle or, as mentioned, the scheme look like.

cross out "the existence"

So in what way does the human learn the existence of concept?

Actually that is a typo, the big idea is that can the common of circles, as you mentioned, be visualized? If not, how can we know that? My answer is not, since when you want to represent the"constant distance" in picture, it has to be in specific size, 3cm or 4cm etc. Not a general notion.

That's because the general one acts as the standard of circle and it must exclude irrelevant factors like color and size. Definitely this is not visible but more of a form. That's where I agree with you. But the point is, how do we neglect that

Sure, you can just draw a circle on a piece of paper, directly you'll see it is a circle 2cm or some other length in diameter. It depends on your what you think

Picture a circle in mind, and you'll always find it is a circle with specific size. In that case, how do we know the general circle from specific circle?