Sometimes it's important to step out of your life for a while.

I spent the last week in Zürich, reconnecting with my Swiss family in the area. A long time ago, I named an open source software platform after a nearby town that my family made their home hundreds of years ago: Elgg. I hadn't been back to the town since I was a child, and visiting it stirred echoes of memories that gained new focus and perspective.

I grew up in the UK, more or less, and while I had some extended family there, mostly they were in Switzerland, the Netherlands and the United States. I've always been fairly in touch with my US family, but not nearly enough with my European cousins. Effectively meeting your family for the first time is surreal, and it happens to me in waves.

Growing up as an immigrant, and then having strong family ties to many places, means that everywhere feels like home and nothing does. I often say that family is both my nationality and my religion. Moving to the US, where I've always been a citizen, feels no more like coming home than moving to Australia, say. Similarly, walking around Zürich felt like a combination of completely alien and somewhere I'd always been - just like San Francisco, or Amsterdam. My ancestors were textile traders there, centuries ago, and had a say in the running of the city, and as a result, our name crops up here and there, in museums and on street corners.

So, Zürich is in the atoms of who I am. So is the Ukrainian town where another set of ancestors fled the Pogroms; so are the ancestors who boarded the Mayflower and settled in Plymouth; so are the thousands of people and places before and since. My dad is one of the youngest survivors of the Japanese concentration camps in Indonesia, who survived because of the intelligence and determination of my Oma. His dad, my Opa, was a prominent member of the resistance. My Grandpa translated Crime and Punishment into English and hid his Jewishness when he was captured as a prisoner of war by the Nazis. My great grandfather, after arriving in New England from Ukraine, was a union organizer, fighting for workers' rights. My Grandma was one of the kindest, calmest, wisest, most uniting forces I've ever known in my life, together with my mother, even in the face of wars, hardship, and an incurable disease.

All atoms. Entire universes in their own right, but also ingredients.

And so is Oxford, the city where I grew up. Pooh Sticks from the top of the rainbow bridge in the University Parks; the giant horse chestnut tree that in my hands became both a time machine and a spaceship; the Space Super Heroes that my friends and I became over the course of our entire childhoods. Waking up at 5am to finish drawing a comic book before I went to school. Going to an English version of the school prom with my friends, a drunken marquee on the sports field, our silk shirts subverting the expected uniform in primary colors. Tying up the phone lines to talk to people on Usenet and IRC when I got home every day, my open window air cooling my desktop chassis. My friends coming round on Friday nights to watch Friends, Red Dwarf and Father Ted; LAN parties on a Saturday.

In Edinburgh, turning my Usenet community into real-life friends. Absinthe in catacombs. Taking over my house on New Year's Eve, 1999, and having a week-long house party. Walking up Arthur's Seat at 2am in a misguided, and vodka-fuelled attempt to watch the dawn. Hugging in heaps and climbing endless stairs to house parties in high-ceilinged tenements. Being bopped on the head with John Knox's britches at graduation. The tiny, ex-closet workspace we shared when we created Elgg, where the window didn't close properly and the smell of chips wafted upwards every lunchtime. And then, falling in love, which I can't begin to express in list form. The incredible people I have been lucky enough to have in my life; the incredible people who I have also lost.

And California too. We are all tapestries, universes, and ingredients. Works in progress.

If we hold a screen to our faces for too long, the world becomes obscured. Sometimes it's important to step out of your life for a while, so you can see it in its true perspective.