I stepped out of the airship-sized glass shed that is the Zoo Station, and walked across Hardenbergplatz to Berlin Zoo’s main entrance, which is just a short way south of the Planetarium. I bought a ticket that included the Aquarium, and a guidebook to make myself look more plausibly a tourist, and made my way first to the Elephant House. A strange man sketching there covered his pad secretively and shied away at my approach. Leaning on the rail of the enclosure I watched this curious behaviour repeated again and again as other visitors came over, until by and by the man found himself standing next to me again. Irritated at the presumption that I should be at all interested in his miserable sketch, I craned my neck over his shoulder, waving my camera close to his face.

‘Perhaps you should take up photography,’ I said brightly. He snarled something and cowered away. One for Dr Kindermann, I thought. A real spinner. At any kind of show or exhibition, it is always the people that present you with the most interesting spectacle.

It was another fifteen minutes before I saw Bruno. He hardly seemed to see me or the elephants as he walked by, holding the small Gerson store carrier-bag that contained the money under his arm. I let him get well in front, and then followed.

Outside the Chicken House a small red-brick, half-timbered building covered in ivy, which looked more like a village beer-cellar than a home to wild fowl, Bruno stopped, glanced around him, and then dropped the bag into a wastepaper basket that was beside a garden-seat. He walked quickly away, east, and in the direction of his chosen station at the exit on the Landwehr Canal.

A high crag of sandstone, the habitat of a herd of Barbary sheep, was situated opposite the Chicken House. According to the guidebook it was one of the Zoo’s landmarks, but I thought it looked too theatrical to be a good imitation of the sort of place that would have been inhabited by these trotting rags in the wild. It was more like something you would have found on the stage of some grossly overblown production of Parsifal, if such a thing were humanly possible. I hovered there awhile, reading about the sheep and finally taking several photographs of these supremely uninteresting creatures.