"Structure includes prominent treatment of the famous duck-rabbit Gestalt switch in which you can see only one of the animals at a time, implying that each represented a different constellation of beliefs or perceptual frame. Kuhn had allowed a metaphorical aid to be taken literally, and later admitted that it had been a ‘dreadful mistake’. He respected the philosophers and was appalled to find that so many of them accused him of being a relativist, an irrationalist or a truth-denier – he was, he said, ‘much fonder of my critics than my fans’."

https://www.lrb.co.uk/the-paper/v45/n07/steven-shapin/paradigms-gone-wild