Check out the "non-Farsi" lettering here:
The variance in the vertical proportions is fascinating.
And contrast it with the "non-Urdu" lettering on this banner*:
http://news.bbc.co.uk/2/hi/south_asia/1545697.stm
* BTW, isn't that the most beautiful hand-lettering you've ever seen? Allahdam amazing.
hhp
) 