The Prague City Museum's centrepiece is a paper model of a city that was later torn down. Antonín Langweil cut it out of paper and card between 1826 and 1837, at a scale of 1:480. It covers the Old Town, the Lesser Town and the castle: more than two thousand buildings across about twenty square metres, each one drawn and painted by hand. You look down on roofs, shop signs and chimneys, at the height a bird would have had.
Langweil was a doorman at the university library who had failed at every trade he tried, and he died poor; the model was bought for a token sum. What makes it the most valuable object in the building is what happened next. The streets he recorded were cleared at the end of the century, most drastically in the old Jewish quarter, where all but a handful of buildings came down. His paper city is what the demolition men found. The museum shows it without narrating the clearance, as evidence rather than argument.