In November, when sunrise and sunset colours continue in unbroken unfolding light from dawn, near 10 a.m., and dusk near 2 or 3 p.m., it comes so quickly that you can see it open and close through the spectrum, as if you are inside a film, a really, really wide-angle 4-D film.

Here is a fraction of a second of its wonder over the volcano in early November, as I walked through flaming heather and pink snow at þingvellir. I shot the image with two much sky to illustrate how unsettling it can be. One feels at times that one can fall right off the Earth and drown in air.