The actual time cube makes sense to me, sort of. Depending on where you start your day, say one of 4 places, you get 4 overlapping days, but only if you choose to recognise all 24-hour periods together. We don't but he does.

IIRC jews start their new day at sunrise, the roman new day started at sunset, westerners start their new day at midnight, the vikings' new day started at midday. I think I see what he's getting at although with mad people I guess you never know.