Re(1): Listener 4349: Black or White by Pilcrow IP: 220.127.116.11 Posted on June 28, 2015 at 01:45:53 AM by Andy Stewart
I agree that it was a series of related ideas rather than a single theme, though no less enjoyable for that. I couldn't find any confirmation of SIXTINE; it's not in the online Oxford, but that's not the full edition. However, it couldn't be anything else given the homophones of the maths series.
One of the best features of the puzzle was the excellent set of clues, which had beautifully smooth surfaces. Replies: