Guardians of the landscape

A classically-inspired Dantean Cerberus guarding the entrance to Hell in British Library, Yates Thompson 36

One way to recognise an otherworldly space is to look for its guardians. The garden of Eden is guarded by a cherub with a flashing sword. Tartarus enlists Cerberus to protect its enclosure. Dante's infernal City of Dis is guarded by unyielding devi…