Why does it seem that a couple of hours browsing round a museum or exhibition is always more tiring than a five mile walk? Maybe it’s the pace, the stopping and starting – experience tells me that a slow, ambling walk is more wearying that one done briskly. And why are there so few seats, or why, like parking meters, are they always taken when you need one? Maybe the curators don’t want you to linger – it’s good to report to sponsors that the maximum number of bodies have been through the door. Or are they afraid that close scrutiny might reveal too many emperors without clothes? Photo: National Archaeological Museum, Athens, Greece, June 2019.