Insofar as revisions are changes the writer makes to the original journey (in the context of a particular instance of writing),

• there are local revisions, and
• there are global revisions.

• at one end (of that line) would be the least significant local revision, and
• at the other end (of that line) would be the most significant global revision

For a particular instance of writing, local revisions
do not (metaphorically) make major changes to the path or essence of the journey (the writer intends for the target audience).

Examples of local revisions (to existing content) include:

• Adding an quotation (with an in-text citation) to an argument (in a particular instance of writing).
• Improving the transitions between the paragraphs (of a particular instance of writing)
• Replacing pronouns (with nouns) to improve the clarity (of a particular instance of writing)
• Dividing long paragraphs (into shorter paragraphs) in order to improve the clarity (of a particular instance of writing)

Global Revisions

For a particular instance of writing, global revisions tend to (metaphorically) change the essence of the journey (that writers intend for their readers); that is to say,

• global revisions tend to (metaphorically) create a very different journey (than the one the writer originally intended) by:
• changing the target audience (for a particular instance of writing) and/or
• changing the desired consequence (of a particular instance of writing)