Stimuli for gloss rating. The 25 stimulus images (a-y) are shown in the order of appearance in the online experiment. Stimuli that were assumed to be ambiguous based on previous studies (Hansmann-Roth et al., 2015, Hansmann-Roth et al., 2017) are highlighted by a red ‘a’. Control stimuli are marked by a green ‘c’ and stimuli without any prior assumptions show a yellow ‘?’. The red arrows in panels u-y highlight different parts of DressO, i.e. the body (u), lace (v) and bolero (w), and of the Jacket, the body (x) and logo (y). In the experiment, ratings were done for the original images without any markers (i.e. without arrows, ‘a’, ‘c’ and ‘?’), which were only added for the purpose of illustration in this Figure. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)