stainlessvision

Multiple Master fonts contain multiple versions (masters) of a typeface, and when combined with the appropriate software, allow you to pick a variant that is somewhere between those masters.

When I read about Multiple Master typefaces in ‘Stop Stealing Sheep’, I was very disappointed to find that Adobe killed the format years ago; however the concept did remind me of a well known feature of Flash, the Shape Tween. This method uses the same word typeset in normal and condensed versions of Helvetica, each letter is tweened between the two styles - you can control the overall width using the slider.

Now, imagine the possibilities this opens up with elastic layout on the web; we can scale our grids with percentage widths (fluid layouts), our images could be scaled with Seam Carving, and our type could be scaled with "Multiple Master" typefaces.
This isn't something you would want to use everywhere (as with the debate about seam carving usage), but it could be useful for decorative text elements that you want to fit to your fluid grid.