Robert Campbell Henderson's discovery in 2018 of a series of twenty-seven engraved copper plates, abandoned in a scrap metal yard in Sarlat-la-Can?da, is an occult event of note, a spark leaping between eras. On finding the plates, Henderson saw they were signed by a local artist Serge Arnoux (1933-2014) and recognised their texts as translations of William Blake's 'Proverbs of Hell', from The Marriage of Heaven and Hell (1793). First published on...