Stroke Weights: The variation in weight provides places for the viewers eyes to jump. The weight also provides emphasis.
Line Spacing: By adding space between the various segments, the content is broken into blocks. By allowing a single line to stand on its own, it recieves extra attention.
Horizontal shift: two flush-left margins: Indents enable the blocking of text. The two layers give separation.
Horizontal shift: three flush-left margins: With three margins it’s possible to get the viewers eyes dancing around the page. The layouts with three levels of indentation provide three means of differentiation.