In 1965, Steve Schapiro started documenting Andy Warhol for LIFE magazine: Warhol was cementing a reputation as an important Pop artist who drew his inspiration from popular culture and commercial objects. With his sunglasses, blond wig, and bland public utterances, Warhol was enigmatic, charismatic, intensely ambitious, and aware that to become a star, you needed the presence of people to document your ascent. Schapiro, also ambitious and hardworking, who in his own words "k...