Escafina Styles
My latest typeface Escafina has three styles, each with progressively thinner hairlines (level of contrast).
All of them are multiplexed to each other, so swapping styles will not cause reflow of text, or different word lengths.
This can function both as an optical size variation (helping to maintain the same appearance at different sizes, printing methods, etc), but also as an aesthetic shift from charmingly succinct to delicately intricate.