A wonderful piece on the ever excellent Google Sightseeing blog, looking at using trees to write words on the landscape.

Arboreal sign-writers agree that uppercase lettering is a no-brainer, as legibility is obviously impaired due to the decrease in the letter size… Here in Bismarck, North Dakota, the typographer has decided on a Grotesque sans serif face, not dissimilar to URW Grotesk Extra Light Condensed, and has chosen to set it at 261,354 point (approx.)

"261,354 point?" I hear you ask.

That's nothing!

It also points out a forest's worth of 2,592,000 point text in Texas...