{Metafont as a design tool} {Steve Peter} {Well-written Metafont sources provide a font designer with a nearly unparalleled tool to explore variations on a typographic theme. Paired with \TeX\ in an advanced environment, the designer can explore serif structure, bracketing, weight variations and more in the context in which the font will be used: real textual matter. I'm going to ignore the production problems inherent to Metafont (not to mention the various possible solutions) to concentrate on the design aspects of this amazing~tool.}