Magic Numbers
7mm
The perfect gutter on a two or three column grid
1.5mm
The space after a paragraph of body text (without a line space added)
3mm
Left-hand indent for second paragraphs
3mm
Text indent all round on a panel/text box
5mm
A good tab amount for body text and tables
2pt
The amount of leading to add for comfy leading, at most smaller sizes
7mm
The margins around a standard business card (55 x 85mm)
141%
The percentage increase in A sizes, i.e., A4 is 141% bigger than A5 (or A5 is 71% smaller than A4)
5pt
A nice width for a rule (line)
