Who was Emily Dickinson? Popular portrayals cast the famed 19th-century poet as an eccentric recluse, a shadowy Woman in White. But “that image seems to be a fabrication, and when you go further into the story or into her work, an entirely different character emerges,” says Kathryn Roszak of Danse Lumière, which stages “Pensive Spring: A Portrait of Emily Dickinson” Oct. 10 and 19 as part of Berkeley Chamber Performances.