Check Out This Optical Illusion That Will Make Your Head Hurt

This optical illusion took me an embarrassingly long time to figure out, even after it was pointed out to me.

Now that I know what it is, it still flips back and forth on me. It makes my brain hurt looking at it for too long. Still not sure what the illusion is about? There is a cigar sticking out of the wall! Go ahead, look again-- the thing that looks like a rock in between the bricks? That's the burnt end of the cigar. Boom.

Don't feel bad, it took me awhile too! Sometimes a cigar is not just a cigar....