Last week I diverted my eyes from my iPhone long enough to attend two readings hosted by Point Reyes Books at the Presbyterian church. Lloyd Kahn, a whiskered Marin original, has spent a lifetime cataloguing an imaginative D.I.Y. building movement and is likely the world’s most perfect grandfather. He took us through his photographs of nomadic, downscaled living from the recent book, “Tiny Homes on the Move,” sharing his own evident wonder at the sometimes…