Optical Illusions

I got these in an email today and was amazed at how the mind can play tricks on the eyes.

I will give you all fair warning that they may be NSFW, depending on where you work. And since I do have a seemingly ever-present contingency of female readers, I'll also say that the illusions tend to work better with raised levels of testosterone (read as "targeted at a male audience"). So...with all disclaimers being filed in a good faith effort to protect the innocence of those who venture beyond this line ___________________________________________

I also linked the illusions to allow the NSFW crowd one last chance to remain status quo within the gainful employ of their superiors.

Here we go:

Illusion #1

Illusion #2

Illusion #3

Illusion #4


Didn't I tell you the eyes can be easily fooled?