Sara and I were in Blue Hill sitting on a picnic table with a five year-old girl, a seven year-old boy and their grandma waiting for the fireworks to start. It had gotten too dark for me to read my book, so I was playing Tetris on my cell phone — a game the kids found fascinating and had apparently never seen before. The girl asked if she could try. I wasn’t quite sure what to say, but grandma interceded on my behalf “no, that’s not a toy.” RIght, I thought, except it sort of is. “Well,” said the boy, “it’s a toy for grownups.” This seemed very wise and I don’t even have my iPhone — the real toy for grownups — yet.