“How Do You Measure a Year?” is a familiar lyric from a song in the Broadway show “Rent”; it’s also the title of a fascinating and experimental short documentary from Jay Rosenblatt (“When We Were Bullies”). Each year on his daughter Ella’s birthday, Rosenblatt filmed himself asking her a similar series of questions, including:

“How would you say we get along?”

“What are your hopes for the future?”