Writer/director Greta Gerwig’s coming of age dramedy Lady Bird (A) is witty and wise and recognizes the nuances and power of mini revolutions afoot in the life of a teenager. Saoirse Ronan is sensational as the titular protagonist, a high schooler who feels trapped in the first world problems of life in Sacramento. The plot centers largely on the pivotal final two semesters of Lady Bird’s senior year as she tests her wry, unconventional outlook against the backdrop of cliques and friendships, parochial rules, drama club, college applications, counseling and school dances. The rhythm of fights with her tough mom, played masterfully by Laurie Metcalf, anchors many of the film’s most poignant moments. These actresses are spectacular at depicting the tempestuous mother/daughter dynamic. Lucas Hedges is also fantastic as Lady’s first love. Gerwig nails the tone and observational humor of episodes that build up to unexpected life lessons. Filled with a blissful Jon Brion score and subtle reference checks to Steinbeck and Sondheim, the film represents an auspicious debut for a talented actress trying her hand behind the camera. Gerwig and her uncanny muse Ronan have created a funny and tender work of utter joy. Moviegoers will enjoy watching this Bird fly.