Figure 1. Photographs of the illuminator equipment and the scene backgrounds, with a plot of the chromaticity coordinates of illuminations used in the experiment.

A. Photograph of illuminator and the viewing box (with front wall removed) under extreme blue illumination, with fake pear, banana and chromatically matched novel objects. B. The Mondrian background used for the variegated scene condition, under D67 illumination. C. The grey background used for the grey scene condition. D. Chromaticities of generated metamers atop daylight measurements taken and digitised from Hernandez-Andres et al. [36], in CIE 1931 colour space; green markers show chromaticities of Ugandan forest canopy illuminations measured by Sumner and Mollon [2].