Another week travelling, this time in the opposite direction. Over the last three weeks, I’ve been in three equally sized corners of the world. I still miss Shanghai.

I’m in Silicon Valley: an endless suburbia straddling San Francisco Bay, and home to some of the brightest technical minds on the planet. Photographic opportunities are somewhat limited, but there are some wonderful gems, not far from the hustle and bustle.

I saw a few curious things on my flight over from London. While travelling past Iceland, I noticed a dark line of shadow imprinted on the clouds far below. It took me a few seconds to realise that it was caused by our own plane’s vapour trail – a shadow cast from far above. What was even more interesting was that the head of the shadow – where the plane should be – was surrounded by a small rainbow. It’s called a “glory” – an optical phenomenon caused by the reflected rays’ passage through tiny water droplets.

Greenland was uncharacteristically bereft of cloud, so I could see clearly the high snowy mountains of the coastline. Deep in the valleys, I could see massive glaciers grind their way to the sea. As the plane headed inland, these glaciers began to engulf the mountain tops, until the mountains themselves disappeared under the enormous ice-cap.

We arrived into San Francisco early, and with time to kill, we headed towards the Pacific Coast Highway, one of my favourite spots in Northern California. Thick sea fog was assaulting the coast, lending a certain dullness to the scenery. We wound our way South from Pacifica to Santa Cruz, past driftwood strewn beaches and high cliffs. It’s a relaxing part of the world.