At Boston's Center for the Arts is the I Sebastiani Company's production of "The Twin Captains." Declaring themselves to be "The Greatest Commedia dell' Arte Troupe in the Entire World," they were founded more than a decade ago, and specialize in performing the mainly improvisational, Italian Renaissance, rough-and-tumble farces in English, based on the 16th century's most rudimentary and simple plot lines. Dressed in traditional costumes, complete with bizarrely comic face masks, their freewheeling and highly exaggerated clowning is abetted and spurred on by the audience's shouted encouragement. Generally recognized as the classic comedic forebear of everyone from Shakespeare and Moliere to Charlie Chaplin, the Marx Brothers and Michael Richards, this production is a good example of the form. Naturally, all the heroes and heroines as well as villains and assorted minor and secondary characters are represented. Lovely young Isabella, betrothed to the dastardly Captain Spavento, was deserted by him six years before, when he left in search of his much nicer brother. While Isabella's bawdy handmaid Olivetta tries to link her romantically to the handsome young unattached Oratio, grandiose confusions erupt when Spavento and his twin Brother return. Well played by the fine young, highly dexterous ten member cast, with high marks for Director Producer, Scenarist, and Actor Alex Newman as the Twin Brothers, with grand comic support from Cat Crow as Isabella, Abigail Weiner as Olivetta, Aaron Santos as Oratio, and Jay Cross as Isabella's foolish, elderly father, and especially Carl West as his animated Jester: Arlecchino! Innovatively staged, in the Arts' complex's smallest playhouse, the winning and energetic cast begins the evening by drawing a large charcoal outline of a classical Italian Piazza street scene on a series of blank white elevated rear backdrops (albeit, separated by some dark curtains) to much, great effect! On the down side, however, thanks to the close and quite cramped performance space, which often tended to overly magnify much of the cast's frantic and humorously shouted dialogue, their comic effectiveness was too often challenged by the room's deficiency. Notwithstanding, this otherwise entertaining and compelling romp, is now playing through July 26. (My Grade: 4)