When this sentence was written, the title of Tania Bruguera’s recent exhibition at Tate Modern’s Turbine Hall was 10,145,915. For the duration of the installation, the title changed to reflect the sum of two changing figures: the number of recorded migrants globally plus the number of migrant deaths since the beginning of 2018. The steady increase of that figure was communicated with a stamp pressed on each visitor’s hand when they entered a small gallery off the Turbine Hall—the title did not appear in an exhibit’s typical places, such as on posters and brochures. It was unclear how frequently the stamp was changed, as the numeric title was dependent on...

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