Rationalists, wearing square hats,
Think, in square rooms, 
Looking at the floor,
Looking at the ceiling.
They confine themselves
To right-angled triangles.
If they tried rhomboids, 
Cones, waving lines, ellipses--
As, for example, the ellipse of the half-
    moon--
Rationalists would wear sombreros.

  -- Wallace Stevens, 
       "Six Significant Landscapes"