The Rainbow Bridge is the theme of several works of poetry written in the 1980s and 1990s that speak of an other-worldly place where pets go upon death, eventually to be reunited with their owners. One is a prose poem whose original creator is uncertain. The other is a six-stanza poem of rhyming pentameter couplets, created by a couple to help ease the pain of friends who lost pets. Each has gained popularity around the world among animal lovers who have lost a pet or wild animals that are cared for. The belief has many antecedents, including similarities to the Bifröst bridge of Norse mythology.