[throwaway_97]

Wait I think I do.. Can't say for sure but they look like two small yellow marbles stacked vertically. What can I say about the polarization of my lcd?

[tjohns]

Yup, that's them. It should look like this, only _much_ fainter:

https://en.wikipedia.org/wiki/Haidinger's_brush

(The blue part is a bit harder to see than the yellow.)

[mikepurvis]

That's a helpful reference. I definitely see it on a 2014 rMBP.