Years ago I read about a Japanese supermarket that had a hydroponic room to the side and they had lettuce growing on a conveyor belt timed so lettuce reached th

Years ago I read about a Japanese supermarket that had a hydroponic room to the side and they had lettuce growing on a conveyor belt timed so lettuce reached the store as the become mature. Customers would literally pick their lettuce off the conveyor belt as they were growing. That's as fresh as you can get. I wonder if someone could take this further to a whole range of vegetables that could be grown on conveyor belts under/over a supermarket and timed to reach the 'public shelf' as they hit the right maturity.