When the name Bridget Riley (b.1931) arises in conversation, various epithets spring to mind; the (he)art of the swinging sixties, the doyen of Op, the arch orchestrator of opera Moiré, I could go on. For those who think that the works are decorative, then of course they are absolutely correct, but of course we shouldn’t make the mistake of thinking that their primary function is to decorate, which it clearly is not. Read on…