India, April 27 -- What happens when an architect marries a landscape architect? They get an urban jungle on their rooftop and a rain garden with a water harvesting recharge pit in the front yard absorbing all the precious water with no overflow, ever. The house becomes a laboratory for all the little experiments a family can indulge in - a playground of projects, a dream house of ideas and community. As Delhi mandates rainwater harvesting across the city to combat groundwater depletion, this house in east Delhi - built by the civil engineer who also built All India Institute of Medical Sciences (AIIMS), particularly the Rajendra Prasad Centre for Ophthalmic Sciences - has one of the most beautiful recharge pits in its front garden. Pipes f...