Ever wondered how the famed children's book Knuffle Bunny intersects with thoughtful urban planning?  Probably not. However, today's guest is well-versed in both! Allison Arieff is editorial director of SPUR, a San Francisco-based thinktank promoting urban planning in the Bay area. Allison writes about architecture, design, and cities for the New York Times, California Sunday, Wired, MIT Technology Review, and CityLab. She is a former editor-at-large for GOOD and Sunset magazines and was a founding editor at DWELL, one of our favorite design publications.  Allison is the author of Prefab, Trailer Travel: A Visual History of Mobile America, and Airstream: The History of the Land Yacht. She's been on NPR, KQED Forum, the Diane Rehm Show, the Sundance Channel, HGTV, CNN Money, and 99% invisible.