In his first public appearance after five years of semiofficial banishment, Curtis Yarvin began to cry. It was late February 2020 and Yarvin was the special guest at a live podcast in Los Angeles. A graphic promoting the event shows the computer engineer turned political philosopher, then 46 years old, wearing his black leather motorcycle jacket and wire-framed glasses and staring out with practiced intensity. Over Yarvin’s left shoulder floats a bust of the deceased rapper Lil Peep. The moody digital aesthetic is called vaporwave. Ma, Pa, have you heard of vaporwave? It is a very of-the-moment style that uses...