This dataset contains a series of reflectance measurements that have been performed on a textile sculpture, entitled 'Infinity mirror room - Phalli's field', from the Japanese artist Yayoi Kusama. The artwork is currently in the collections of the Museum Boijmans van Beuningen, Rotterdam, under the inventory number BEK 1859a-y. These measurements, performed by scientists from the the Rijksdienst voor het Cultureel Erfgoed on the 21st of April 2023, should be used to perform long-term monitoring of the colours of the object.