When I was a kid, the Armbrusters had a slide projector.  Which meant that after every vacation they took, we’d troop dutifully to their house for endless carousels of badly-shot Kodachrome slides, narrated  live.  The slide show always seemed longer than the vacation itself.  Washed-out, badly composed views of Disneyland or Paris—dotted here and there with the back of the head of someone we knew. Today technology has changed everything.  People can record hours and hours of vacation video on a single chip.  But they don’t trap you in their living rooms anymore.  Instead they email links to their hour-long…