A screenprint by the artist Damien Hirst (b. 1965), which is to be auctioned by Christie’s Online, next month. The 120×120cm image, Cathedral — Duomo, depicts hundreds of butterflies, printed in inks, glazes, and pearlised colours. Last week, the UK wildlife charity Butterfly Conservation declared a national “butterfly emergency”, after its annual Big Butterfly Count, conducted in July and August, recorded its lowest-ever numbers