Warhol attended the 1962 premiere of the static composition by La Monte Young called "Trio for Strings" and subsequently created his famous series of static films. Filmmaker Jonas Mekas, who accompanied Warhol to the Trio premiere, claims Warhol's static films were directly inspired by the performance. Between 1963 and 1968, he made more than 60 films, plus some 500 short black-and-white "screen test" portraits of Factory visitors. One of his most famous films, "Sleep", monitors poet John Giorno sleeping for six hours. The 35-minute film "Blow Job" is one continuous shot of the face of DeVeren Bookwalter supposedly receiving oral sex from filmmaker Willard Maas, although the camera never tilts down to see this. Another, "Empire" (1964), consists of eight hours of footage of the Empire State Building in New York City at dusk. The film "Eat" consists of a man eating a mushroom for 45 minutes.