His Majesty's Secret code..?

Wondering if there's anyone out there who can answer this...

Above the auditorium in His Majesty's Theatre, Perth, is a gorgeously ornate painted ceiling. I understand it was originally built as a dome that could open to the open sky, but with all the pigeon feathers and dust etc that was likely to drop onto the seating area, it was rebuilt as a solid roof, but painted to give the impression it is still a huge dome.

While looking up at it, I notice among the concentric circles there are little squares with letters of the alphabet printed in them. They are symmetrical across the circle, but apart from that I can see no pattern that makes any sense. I haven't noted down the letters, but they appear really random ...J M D C L etc...about 15 different letters repeated twice around the circumference...


Can anyone enlighten me as to what they mean?



Cheers
Craig

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