To slug a document is not to scan the text itself, not the words and sentences and their meanings, but rather the contours of the text, the shape it makes on the page. The justification.

I spend hours slugging at my pharmaceutical agency jobs, usually comparing the new round with the last, sometimes reading the words that begin and end a line and reading them again on the backup, thinking about the bad, accidental poems that they make:

Call
Allergic
treatment
chest
or
Your
of
if

Sometimes I abandon the meanings of the words completely—they're too distracting. I see them only as curious arrangements of bent and twisted little lines. I see them as they really are.