What is an important motif in the story, Under the Volcano?

In Under the Volcano, Malcolm Lowry introduced the Northern Paradise motif., and he takes it well beyond to the place where the Northern Paradise teeters toward hell. It chronicles what befalls the transcendent spirit when the threat of eviction jars the delicate balance between ecstasy and damnation. Although sadly unfinished and fated for a kind of posthumous limbo, this is the one book which showed evidence that Lowry could consolidate the gains of Under the Volcano and go on to new ones.