“Falling in love” is a fascinating expression. In my native language, Chinese, the two most-used equivalents of the phrase compare love to things one could physically fall into, such as a river or a net, but English expression might just be superior because of its ambiguity. Do we fall into love, or are we falling when we’re in love? The Kitchen Theater’s Bright Half Life seems to say it’s both. Written by Tanya Barfield and directed by Sara Lampert Hoover, Bright Half Life is a two-women play that follows the story of Vicky (Shannon Tyo) and Erica (Jennifer Bareilles) through the decades.