Rounding to a convenient number?
I remember when 30 mm was "Humans" (defined as heroic 6 footers... Conan of Cimmeria mindset...) and (5' tall) Elves were 25 mm tall, Dwarf (4') at 20 mm, and I think (3') halflings as 15 mm figures... I blame Gygax from the old "Chainmail" gaming.)
Now I need to go check out the pages of my copy... I think fantasy adventure Humans he suggested two scales (30 and 40 (?) mm tall humans for the basic sizes...)
Gracias,
Glenn