Episode 4: “Right or Left Brain?”

Now I know this video isn’t really an optical illusion, but I can’t figure out what to call it then. Something like divergent perception, or so? I’m also not completely buying the whole right side/left side of the brain story (not in this case at least). I’ve seen this video a couple of times and after a while it switches directions. With most of these types of visual tricks, you can figure it out and force your brain to perceive it in another (I love jumping back and forth between the two perceptions of this image). This one though still continues to elude me.