Two of Lai Tak Tsuen’s blocks are twin cylinders — a pair of joined concrete drums apiece, four in all — and each drum is hollow, its 27 storeys of access balconies ringing an open-air atrium that runs uninterrupted to the sky. The shape was not a flourish: announced in 1969 and delayed three years by a landslide on the steep Tai Hang slope, the drum packs flats onto a small hillside footprint while giving a deep plan its own light-and-air well. It was finished in 1976 by the Hong Kong Housing Society, and it is still full of people who live there — coded gates and posted notices now prohibit entering or photographing the blocks without permission, put up precisely because the Ghost in the Shell (2017) shoot and the photographers who followed it turned a residential estate into a backdrop. The view up the drum is extraordinary. It is also not yours to walk into.