Angry VS Calm

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 feet!! They switch places!!

P.S.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??