  This paper explores the geometry of putting in the limiting case of a planar
putting surface. Putts equidistant from the hole originating on an arc spanning
\pm30 degrees are shown to share a common target point. Moving around the
circle of all equidistant putts, the ensemble of target points map out a small,
diamond-shaped structure centered on the fall line directly above the hole. The
position and size of this target diamond for any length putt on a putting
surface of any grade and speed is reasonably approximated by a single universal
curve. This understanding suggests a practical methodology for reading putts.
Instead of lining up only the putt-at-hand, the golfer should line up all putts
known to share a common target point. This methodology will increase the
probability of choosing the correct target line.
