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IN NEW ZEALAND, a few pieces of driftwood were all it took to keep my three iPad-devoted daughters occupied for hours. My wife, kids (a 15-year-old and 8-year-old twins) and I were on day four of our two-week RV trip through the country, and we had just pulled into a beachfront campsite on the South Island’s Lake Wanaka. The girls saw the mountain-ringed shore full of washed-up detritus and began building pyres (that could never be lit), wielding sticks to re-enact scenes from “The Empire Strikes Back,” and forgot all about the tablet. After Darth Vader and Luke tussled with their lightsabers, we made sandwiches in…