Multiple putt lines should have a common target

[B-Con]

I just came across this article: http://www.technologyreview.com/view/424278/mathematics-reveals-new-approach-to-the-perfect-putt/ On a flat, gradient surface (ie, no saddlepoints, etc), all equidistant putts have ideal targets that are about the same spot. So you can read your own putt by reading several different putts of the same distance, as they should share a common target point. The paper is from 2 years ago, but it was neat to see analysis behind this approach. I forget where I first read about this approach, I think it was on this forum. Regardless, I've been using it for a while. I've found it particularly useful on mid-short putts where I'm having trouble deciding how much break there is. Mainly just throwing this out there, in case anyone else finds it interesting. :-)