Working through Hindemith's harmony I encountered the following diagram of all the valid positions for a C-Major chord in strict four-part writing.
I am befuddled as to why the third chord in the second measure is marked as open while the (same) chord in the second measure is marked as close. See the image included.
My understanding is that an open chord is one in which the degrees of the triad in the four voices follow the order of the original triad. Am I missing something huge or is this simply a typo?