His hand reached up for mine without him looking. We were crossing the car park and he didn't break his sentence — something about a beetle he'd seen, the size of it, whether it could fly — and his fingers just found my hand the way water finds the lowest point in a room. Automatic. Trusting. I took it, and I was already three steps ahead in my mind, thinking about the bags in the boot and what we hadn't bought and the email I'd half-answered before we left.

I held his hand. I did not feel it.

That's the thing I keep coming back to. Not the missing of big things — I notice those, mostly, the milestones and the bad news and the days circled on a calendar. It's the small ones. The ones with no name and no weight, that arrive and pass in the same breath, that make up — when you actually add them — almost the whole of a life.

There's a particular quality to a child's hand reaching up. It comes from below your eyeline, so you feel it before you see it. And if you're honest, most days you register it as logistics. A thing to manage. Hold the hand, cross the road, keep moving. The actual texture of it — the warmth, the slight stickiness, the complete faith of the gesture — slips straight past you because you are, as usual, a half-step ahead of yourself. Living in the next moment before this one has finished happening.

I think we mistake this for being busy. I did, for years. I called it being organised, on top of things, ahead of the curve. What it actually was, I see now, was a kind of low-grade absence. I was rarely where my body was.

Let me tell you about the light, because that's the one that finally got through.

Late afternoon, our hallway. There's a window at the end of it that does nothing remarkable for most of the day, and then for maybe twenty minutes around four o'clock the sun drops low enough to come straight down the length of the floor. The boards go gold. Dust hangs in it and turns to small slow sparks. It is, by any honest measure, beautiful — and for years I walked through it the way you walk through a doorway, which is to say not at all. It was just the bit of hall I crossed to get the washing.

One day, not long after I'd started sitting still for ten minutes in the mornings, I came down that hall and the light stopped me. Nothing had changed about the light. Something had changed about the speed I was moving at on the inside. I stood in it. I felt it warm on my arm. And I had this strange, almost grief-like feeling — how many times had I walked through this, how many four o'clocks, gone, not missed exactly but never had.

That's the cost, I think. We talk about missing moments as though they're stolen from us, but no one takes them. We simply aren't there when they happen. They occur, fully formed, perfect, and we're elsewhere — in the email, in the worry, in the rehearsal of a conversation that may never happen. And the small ones never come back to ask why we weren't paying attention. They're too modest for that. They just don't get kept.

I started noticing the sounds, after that. The specific clunk-and-sigh of our front door, which sticks slightly and then gives. The way it means someone is home before I've even worked out who. I'd heard that sound ten thousand times and never once heard it. Now it lands. A small homecoming, several times a day, that used to cost me nothing because I never collected it.

What I found — and I offer this gently, because it isn't a technique and it certainly isn't a fix — is that the small moments don't ask for more of your time. They ask for the smallest amount of your presence. A half-second of actually arriving. The stillness in the mornings didn't give me more hours. It gave me a slightly shorter gap between a thing happening and me being there for it. That's all. That tiny gap, narrowed, changes the texture of an ordinary day more than I would have believed.

Because here is what I missed for so long, hurrying past my own life to get to the important part: the important part was the part I was hurrying through. It was the hand reaching up. It was the gold floor and the dust. It was a face across the table, mid-sentence, lit and unguarded and never quite that exact way again.

So this is the one thing I'd offer you, if you wanted it. Pick a single small moment that already happens in your day — one you've decided is too ordinary to deserve you. The handing-over of something. A face turning towards you. The light in a particular room at a particular hour. And the next time it comes, instead of getting through it, stay in it for the length of one breath. Don't improve it or photograph it or tell anyone about it. Just be there while it's there.

You will be amazed how much was waiting in something you thought was nothing.

His hand still finds mine in car parks, though less often now; he's getting to the age where he forgets, then remembers he's meant to be too old for it. The other day he did it again, mid-sentence, not looking. And I felt it. The warmth and the trust and the small sticky weight of it. I felt the whole of it, for one breath, and then it was gone, the way they all go.

But that one, I kept.