The gathering has the vibe of a pilgrimage, the preparations unfolding with quasi-religious grandeur. Several enormous speakers, arranged on a dance floor of sand, have the coldly inanimate majesty of the monoliths in "2001: A Space Odyssey" (1968), as if they were sonic portals, transmitting pulses from an alien dimension. The music that pours forth, composed by the electronic artist Kangding Ray, is magnificently transporting, and the ravers surrender to the beat with glorious delirium.