"Human Nature" is Michael Jackson being watched. He recorded it in 1982 as a song about a man who feels eyes on him everywhere he goes, a surveillance state of the heart. The keyboard riff Steve Porcaro wrote is not a melody so much as a stakeout signal, the sound of blinds opening at 2 a.m. Jackson sings about a woman who keeps appearing in his path, but the real subject is the vulnerability of being seen when you are not ready to be seen. The most private moment is the one being watched.