Dominant Eye Determiner

Since I was early for a meeting in the library this morning I browsed through a recent copy of "Astronomy" magazine while I waited. (Read: Astronomy...not that other stuff!) Below I've reproduced an illustration I found intriguing.


How it works: Look at the diagram while crossing your eyes slightly to make three circles appear. The word that appears in the middle circle tells you which eye is dominate.



The article provided a reason why this is helpful to know, but only in relation to studying the stars. Otherwise, I'm not sure why it matters exactly!