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A designspace (sometimes written as “design space”) is a system specified during the type design process that controls how a variable font’s appearance changes, via interpolation from the master designs and glyph substitution, as its variation axes are adjusted.
Each variation axis can be conceived as a dimension in the font’s designspace, so each distinct set of axis values implies a unique location in the designspace, and each unique location results in a unique instance. For example, a variable font with Weight and Width axes has a two-dimensional designspace, containing all variants of Weight and Width. Some advanced variable fonts, such as parametric fonts, have 10 or more axes; therefore they have designspaces of 10 or more dimensions.