Sirin is VN's Russian nom de plume; orgitron is VN's neologism; Sorin and Trigorin are characters in Chekhov's play "The Seagull" (1897). Trigorin comes from tri gory, "three mountains." Like seagull, Sirin is a bird. Cf. The irreversibility of Time (which is not heading anywhere in the first place) is a very parochial affair: had our organs and orgitrons not been asymmetrical, our view of Time might have been amphitheatric and altogether grand like ragged night and jagged mountains around a small, twinkling, satisfied hamlet. We are told that if a creature loses its teeth and becomes a bird, the best the latter can do when needing teeth again is to evolve a serrated beak, never the real dentition it once possessed.