I landed in London around 6 am. As we were still in the air, about 3,000 m above sea level, I looked down and saw London (and its sprawl) in the twilight. It was a huge expanse, dark for most parts, but streaked with dense, meandering canals of lighting.

Suddenly, the picture reminded me of a plain at the foot of an invisible volcano, irrigated by molten lava!

I wish I had taken a picture. Will do next time.