Along the border of the ‘Garden of Knowledge’, there were outlook towers from which you could get an overview of the garden, if you dared to climb up. I called them ‘Castles in the Air’. They were a cross between a birds’ nest and a power-line pylon. It was pure luxury to sit up there cosily and comfortably sheltered in a stable structure covered with soft straw. To find oneself high up in a birds’ nest gave a sense of superfluous abundance, comparable to life in a palace, superfluous but at he same time necessary. The lowest tower was only one and a half metres high, the highest eleven.