23 Wenlock Road, London N1 7SB, UK

Story - 23 Wenlock Road, London N1 7SB, UK

I can tell you the postcode. I can tell you the flat number. I can tell you which step on the staircase creaked, the third one from the bottom, and that the radiator in the bathroom never quite worked but the one in the kitchen worked too well, so you had to leave the kitchen door open or you'd boil. I can tell you that the light in the front room came in sideways after three in the afternoon and made the wallpaper look warm, which it wasn't, the wallpaper was cold to the touch, I checked once.

What I can't tell you is when it became home.

It wasn't the day I moved in. That was boxes and a man with a van who charged me forty pounds extra because the lift was broken. It wasn't the first night either. I slept on a mattress on the floor and the traffic on Wenlock Road sounded like someone dragging furniture across a ceiling that went on forever.

It might have been the morning I opened the window and a bird came in.

Not a dramatic bird. A small one, brown, the kind you see and don't see at the same time. It came in through the window and sat on the edge of the kitchen counter and looked at me with an expression I'd describe as professional interest, if birds can have professional interest, and I think they can. I was eating toast. The bird was not eating toast. The bird was conducting an assessment.

I opened the other window, the one above the sink, and the bird left through it. Both windows open, a current running through the flat, and for about thirty seconds the air moved from front to back and the flat was not a room but a corridor, a passage, a threshold between one outside and another.

That might have been when it became home. Not the bird. The air.

I lived there for two years and seven months. I know because I counted when I was leaving. Two years and seven months is not long in the scale of a life but it's long enough for a place to get into your fingers. The light switch by the door - you reach for it without looking. The way the hallway turns - your body knows the angle before your eyes confirm it. The sound of the neighbour's television through the wall - you stop hearing it, and then you hear it again the night before you leave, and it sounds like company.

When I was packing I found a piece of fabric behind the wardrobe. It must have been there when I moved in. A square of translucent polyester, about the size of a pillowcase, the kind of fabric you can see through but not quite - like looking through a window with condensation on it. I held it up to the light and the whole room turned soft, the edges of things blurring, the wallpaper becoming a colour it wasn't.

I folded it and put it in my bag.

I've moved three times since then. Each time I unpack the fabric first. I hold it up to whatever window is nearest and the light comes through and for a moment the new place has the same soft quality, the same blurred edges, and I think: this is not the same room but it is the same light. The light is what's portable. The postcode stays on the door. The step stays creaking. The radiator stays broken. But the light comes with you, and the air, if you open both windows, runs through.

I can tell you the postcode. I can tell you all the postcodes. They are lined up inside me like rooms in a corridor, each one a door I can open, and behind each door the light is slightly different but the air moves the same way - from one outside to another, through the space where I lived, where I was briefly still, where a bird once came in and looked at me with professional interest and left through the other window.

I am not leaving. I am learning what is portable.

The fabric is portable. The light is portable. The knowledge of which step creaked is portable. The feeling of home is portable. The postcode is not portable but the memory of the postcode is.

I am carrying all my rooms at once. They are not heavy. They are present.

And the road goes on, curving through hills the colour of something warm, and I follow it because it is the road, and the road is the line, and the line is the way you learn what home means by leaving it and finding it again in the next place, and the next, and the next.