Example:
Then I moved the camera angle just a little and it's back to normal..
It happens for me in both MBG and MBP so I'm thinking it's a graphics card issue. My card is Intel HD Graphics 4000 and I'm on a 2012 Macbook Air. According to Apple, the following Macs all share that same graphics card:
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MacBook Pro (13-inch, Mid 2012)
MacBook Pro (Retina, 13-inch, Early, 2013)
MacBook Pro (Retina, 13-inch, Late 2012)
MacBook Pro (15-inch, Mid 2012)
MacBook Pro (Retina, 15-inch, Early, 2013)
MacBook Pro (Retina, Mid 2012)
MacBook Air (13-inch, Mid 2012)
MacBook Air (11-inch, Mid 2012)
Mac Mini (Late 2012)
If you have a Mac on that list, do you experience this problem too? Please also list your OS--I'm on 10.8.4.