Suzann Pettersen at the 2014 Kingsmill Championship - Classic EyeLine Putting Mirror

One very interesting detail you can see, if you look closely, is a red chalk line she has created.  It runs directly under the center line of the mirror all the way to the hole.  This would be an awesome practice setup to try!

Click Here for details on the Classic EyeLine Mirror >> 

Images found at golfwrx.com