Since we were talking about acute angles, here is a “flatiron” building at the acute angle of the intersection of Main Street and Washington Avenue in Carnegie. Pittsburgh and its surroundings are full of these triangular buildings, because Pittsburgh topography makes it very difficult to lay streets out in a simple grid.
If it isn’t the sharpest, it must at least be close. Father Pitt remembers when the East Wing of the National Gallery of Art was going up in Washington (Big Worshington, that is): it was boasted that I. M. Pei’s design included the most acute angle in any American building. This angle is nearly congruent with Pei’s, except that here the point has been slightly blunted. The architect has made sensible use of that sharp corner by putting the stairwell there, with a column of windows to light it.
