Between blotch and blok

My friend Catmunk, who lives in London, went to see the exhibition with his partner, and he says he remembers a faint scent as of decomposing flesh... which he agreed afterwards must have been hallucination, though it didn't strike him as such at the time.

(I don't know whether I would have gone or not. Probably not, unless it had occurred to me to "challenge" my ability to do so...)