Constant In Opal

The title of the song is a pun on the name of the city of Constantinople, and the lyrics reference one of its historic periods when this city, many times to many ancient and not-so-ancient people a place to see before one died, was utterly destroyed, and people dug through the ruins to rebuild or find salvageable items. I've studied up on this city myself, and I agree with the suggestion that if you read the Wikipedia article, it'll become much clearer. Kilbey has a great interest in historic times, religions, societies, ruins, and the like, and references to them are scattered throughout his work.

Opals actually come in many color varieties and have been thought of as increasing awareness or having properties useful to scrying. This fits in with references to magic (as religion, technique, or both) and divination that everyone in the band has made at various times.

This song is actually very introspective. I think it refers to an insight to his own personality or an event in his own life, perhaps even a relationship with someone (not necessarily romantic, although he wrote songs about the ending of such on the preceding albums). Even if it isn't actually about him, though, it's easy to see through the metaphors if you try. Kilbey even gives a hint with the entire third verse. He references hands (a very common symbol for works or what one produces with his efforts) numb with jealousy (fear of loss, not to be confused with envy) and the storms that "transform effortlessly" within them. If this vision leaves you feeling uneasy or disturbed, you're on the right track, because whatever event he's recalling, seemingly with resignation in the face of regret, ended badly, to say the least.

I really feel that this is one of his best songs ever. He often strikes a balance between metaphor and vagueness, suggesting a story or a message without actually telling or conveying much of one, and sometimes without a point altogether beyond the images you invoke from what he gives you. The specifics are often irrelevant--would only take away from the fun, as well as serve to distract. Coupled with this is his constant theme of finding meaning. Both of these feature prominently in this song.