Exercise your brain
Which way do you see the image above turning? Clockwise? Widdershins? Supposedly, the way you initially perceive it is supposed to tell you something about which way your brain is oriented. But I just think it's cool to try to go back and forth from seeing it move one way to the other. Like doing light-weight reps with your cerebellum.
I've literally spent hours staring at this thing until I can get it to turn either way at will. So, yeah, that's what I've been doing instead of blogging. Sorry.