Rotis Sans or Semisans Light.

Thanks!!

damn too late. wonderful book, wonderful grid and typesetting. :).

rotis sans or semisans as barthak said. (for the next time, you can automatically resemble it by that lowercase e :).
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golden ratio of passion. sansogno.coastaldisturbance.com

The book is by Otl Aicher... that shudda been a dead giveaway!

FYI— the book was originally typeset using a pre-released version of Aicher’s Rotis. After we got it at Agfa-Cg (Monotype Imaging) we did a lot of re-tooling the outlines and spacing (with the blessing of Herr Aicher).