His intelligence was, above all, detached and reasonable--and what is a mind for, except to reason with?
from Death Be Not Proud by John Gunther
He describes "his intelligence" by using an appositive and descriptive words. Then, he uses a dash to, once again, go into deeper thought, leaving the sentence as a rhetorical question.
Her clothes were, above all, cute and fashionable--and what are clothes for, except to characterize with?