Inton (Yin Release) makes a form that has no life. This is used for Genjutsu. Yōton (Yang Release), breathes life into an object. This is used in Elemental Ninjutsu. Together they make Onmyoton (Ying-Yang Release), which is what the Rikudō Sennin's Banbutsu Sōzō which creates things out of nothing.