Joana Hadjithomas recalls having to say goodbye to her best friend. It was 1982, not a good year in Lebanon’s 1975-90 Civil War, and her pal’s family were relocating to Paris. “We promised that we’d write each other every day,” the artist-filmmaker says during a phone call from Paris. “We did that for six years. Every day we recorded tapes with music and sounds and sent letters. At the end ...