Llama Land

angry/calm

This is one of the coolest visual effects I've ever seen. I'd like to find an explanation of how this works, since the best I've found is some vague reference to hi/low pass filters.
Thus far, work has been ok this week. However, I have a bad feeling all of that is going to change come Thursday, when I have five days of covering windoze yet again. Wish myself luck.