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For example, when choosing a pair of typefaces to combine in a single line, it is advised that:

  • they are from different categories, in order to make them contrast
  • they should have the same x-heights, in order to make them smoothly reading

(How to know which second typeface should be used, given a contextual typeface?)

I wonder, what if the difference in x-height would be contrast enough, yet the smoothly reading requirement is still satisfied? Therefore, even if the pair come from the same category and it's a no-no, it would become insignificant or even unaffected to the viewer's eyes? How to make such thing happens?

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    Graphic design is more of an art than a science. Rules are there to be broken. – Westside Mar 6 '18 at 6:17
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    "Rules? We don't need no stinkin' rules!" (overheard on a Bolivian trip to a design conference) -- The reality.. guidelines are guidelines not end of the world mandatory requirements. Break them whenever a design works better without them. – Scott Mar 6 '18 at 6:26
  • To be clear: your example using typography is only an example? You're mostly interested in the larger question? – Zach Saucier Mar 6 '18 at 8:14
  • @ZachSaucier yes. Would it be too broad? – Ooker Mar 6 '18 at 8:16
  • @Scott does this mean different designers will have different opinions on the same design? – Ooker Mar 6 '18 at 15:51