Look it from a distance (great illusion)

There are two pictures here...
Let me know if you could view this.

If you watch the above images from your seat in front of
the computer, Mr.Angry is on the left, and Mrs.Calm is
on the right.

Get up from your seat, and move back about eight feets!!
They switch places !!

I believe this illusion was created by Phillippe G. Schyns
and Aude Oliva of the Univ. of Glasgow.

This proves that we may not be seeing what's actually
there, all the time!!

I do not know how they generated this fascinating image,
and I believe no-one else is able to generate anything
similar in Photoshop. I know it has something to do with
"low-pass" and "high-pass" filters, but the details??

if u know the xactly wts happening then tell me...