form vs. line.

ruminating for a short while over tea on thursday with my friend, neighbour, and photoshop guru Diana, who is the world's answer to translating age-old art concerns into the digital world. she asked me what i thought the difference was between line and form.
as someone whose drawing tends toward the form-ing of things, and mistrusts my own lines always, i didn't know that i had a satisfactory response, but here's what i came up with, and even if the logic is faulty, boy does it sound profound :

form indicates there is already an answer, while line expects that there can't possibly be one.