Advent is traditionally a time for meditating on last things. Sounds gloomy, but the point is that the winter solstice, the longest night, points towards lengthening light. The ancient dwellers of these islands knew it: Maes Howe in Orkney is built so that the solstice sun strikes to the heart of the burial mound. The Christian faith declares it. A rose is born in midwinter, the old carols declare. Advent heralds Nativity: new birth, new life, new hope. So although the following nocturne sounds a little bleak – it ends with light.