Orson Welles' 1941 Citizen Kane has been cited as the greatest film ever made from so many different quarters — the American Film Institute, the long-running Sight and Sound survey, even Creative Loafing's own poll way back in 1998 — it's a wonder that a Congressional law hasn't been passed making it required viewing for anyone who claims they like movies. With his first picture, writer-director-producer-star introduced and/or perfected a slew of innovative cinematic techniques, as well as related a damn good mystery ("Rosebud") and an even better character study. If you've never seen it, or want to see it again for the umpteenth time, here's your chance, as the Main Library is kicking off its annual slate of free movies with a screening. This will be followed on Jan. 29 by another Welles gem, 1948's The Lady from Shanghai. Free. 2 p.m. ImaginOn's Wachovia Playhouse, 300 E. 7th St. 704-416-0252.