on is made up entirely of qualities of
     |  feeling as truly as Space is entirely made up of points. ...
     |  no collection of points ... without the idea of the objects
     |  being brought together can in itself constitute space."

JM:  What is yours?

Form.  From Latin "forma" = "beauty".
There's more to say, of course, but
that is all you really need to know.

Relational Structure.  Any relation
viewed with an eye to its form, q.v.

Relation.  Here I see two cases:

1.  Relation in Extension = a 