From William M. Kantor's 1978 review of Peter J. Cameron's
1976 book Parallelisms of Complete Designs—
"There are three ways an area of mathematics
can be surveyed: by a vast, comprehensive treatise;
by a monograph on a small corner of the field; or by
a monograph on a cross section."
An area of mathematics—
A small corner of the field—
A cross section—
The area— Four.
The corner— Identity.
The cross section— Window.
The three ways— December 8 ten years ago.