Fun image involving a hug-see if you can figure it out

If you know me you know that I love hugs, it doesn't matter if it's an actual hug, sign about a hug, or a picture of an actual hug. Thus, naturally, I was taken by this picture of two people hugging which is an optical illusion. See if you can figure it out. The explanation for the picture can be found by following this link: http://www.huffingtonpost.com/entry/this-hug-optical-illusion-is-going-to-make-your-brain-melt_us_574857d9e4b0dacf7ad4a3bd?utm_hp_ref=good-news.