It's along the same lines as this famous image:
It's either two faces or a vase depending on how you look at it. Lots of psychological and neurological studies exist on this matter.
To summarize
Quote:
The evidence available to date suggests that subliminal perception does occur, but that it has no potential for "mind control."
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http://college.hmco.com/psychology/b...ines/ch05.html
Of course it could be the fact that
Planet X is controlling my brain that I arrived at that conclusion.