The more things change, the more they stay the same—especially for a contemporary arts festival founded to highlight the most cutting-edge innovations in art. The Time-Based Art Festival—PICA’s flagship event for the past 20 years, known to most of us as TBA—is going through some changes this year. As an experiment, Portland Institute for Contemporary Art (PICA) has modified the 10-day whirlwind format of past years, opting instead for a more leisurely timeline of performances.