Conservation is not mathematics, says Ratish Nanda, the man behind the renewed Sunder Nursery, which aims to rival the Mughal Gardens. The park was opened to the public last month after a nearly decade-long restoration and redevelopment project. It sits next to Humayun’s Tomb, which, along with Nizamuddin Basti just across the road, forms the core of the 44-year-old Nanda’s work as chief executive of Aga Khan Trust for Culture in India.