The stamp is based on Balor, a legendary Formorian known to cause great pain and anguish in the stories in The Mythological Cycle of Irish folklore tales. The story of Balor is an eye that when unleashed could cause instant death or poisoning, such as the Poisoned Glen in Co. Donegal, where Balor only looked on the landscape and caused damage. Contemporary colours are used to create the impression of poison, almost leaping off the stamp.