Three plays by Tarell Alvin McCraney that have several characters in common, take place mainly among Blacks in Louisiana bayou country and move forward in time are billed as a Trilogy.  The Brothers Size, in the center, is built around a significant conflict and is a fine one-act play.  The other two are choreographed, and dramatically and aesthetically lit — there are some great effects but one senses the hyper treatment is making up for their weakness as plays.  The Brothers Size, presented in a straightforward fashion, carries its own weight.  McCraney writes with a fine poeteic realism throughout, and the acting in all three plays is excellent but Marc Damon Johnson as Ogun Size in The Brothers Size is monumental.   The names of the characters are drawn from Yoruba gods.