Each of the family are categorized in following family collections: Classic, Basic, Office. Classic family includes all 8 font weights, with roman, italic, small caps roman, small caps italic, expert, expert italic in each weight. It includes hanging proportional, hanging monospaced, lining proportional, lining monospaced figures; and additional f-ligatures. Expert fonts include arrows, swashes, fraction figures, alternate styles, mathematic symbols, ornaments. Basic family includes all 8 font weights, but without small caps and expert fonts. It includes lining proportional figures (smaller than in classic). Office family only includes Regular and Bold weights, with only roman and italic in each weight. It includes hanging monospaced figures. de Groot's choice of weights to release was developed using an "interpolation theory". The optical interpolation
b, in the three stems
a (thinnest),
b (interpolation) and
c (thickest), is set to the
geometric mean of
a and
c, i.e.
b² =
ac (as opposed to the linear
arithmetic mean). As an amusement, de Groot also developed a number of parodic reworkings of Thesis, including Nebulae and JesusLovesYouAll. == Uses of Thesis fonts ==