Kimbal Musk, co-founder of farm-to-table restaurant group The Kitchen, board member at Chipotle, Tesla, and SpaceX, and younger brother to Elon, thinks hydroponic vertical farming —that is, soil-less, indoor, LED-lit agriculture — is the future of food. Dan Barber, renowned chef, restaurant owner, author of bestseller The Third Plate, and crop rotation evangelist, strongly disagrees. In August, Musk announced a new venture called Square Roots.