Confused with the way lists work

I got pretty confused tonight with the way Lists work.

Here is a simple example of my problem:

I have a line, I divided it into segments, then used the segment points as a center for polygons. Now that I have the polygons, I want to divide them into the first polygon or (the second, or the last one) and the rest polygons. But there I got confused as the "item" component does not work here, in the same way like it would work when I am extracting the data from a classic list.

What I am trying to say is that: I though that the fact that I have a couple of polygons, means that I have some sort of a list of polygons, and there for that I can extract each of those polygons from that list, as I would extract the classical data (number) from a list - by using a "Item" component. But it seems I am wrong.

Can somebody explain this to me?

Thank you.

[img]http://imageshack.us/f/818/listir.jpg[/img]