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Creating something ‘whimsical’ … the mini living room Derek and Sarah created for their cats. Photograph: Handout

Lox is sprawled out on a green sofa, bathed in warm light from a standing lamp, framed art on the wall behind him.

This may sound like a relatively ordinary description of someone in their living room – except that Lox is a cat, not a human, and the “living room” he shares with another cat, Lottie, is a converted cupboard in a New York apartment.