Next door, there’s always laughter.

Through the wall I catch the clatter of dishes, someone calling someone else’s name, feet pounding down the stairs. Four kids — of course it’s loud, morning and night. The oldest is the serious one. The second has pale skin and says almost nothing. The third is built like a linebacker and somehow the most sensitive. The fourth you almost forget is there.

Our house has one.

My son keeps a thick hoodie pulled low over his face. He doesn’t show it much. Quiet kid, never seemed to mind being alone. He’d line up containers of water in the backyard and stare at them for hours. I asked him once what was so interesting. “The shape of the water keeps changing,” he said.

I talk to the neighbor over the fence sometimes. Just standing there, the way neighbors do.

“Must be nice, how quiet it is at your place,” he said one afternoon.

“Four kids — every time one of them screws up, the whole house gets dragged into it. The oldest pulls everyone around like gravity. The second one absorbs everything. The third is huge but falls apart easy. And the fourth — some days I can’t even tell if they’re home.”

I almost said I know what you mean. Caught myself. I don’t know what he means. Not really.

We have one. Breakfast is quiet. The only sound of dishes is mine and his. In the evening I hear his shoes come off at the door, and then the house settles back into silence.

Sometimes I’d watch the four of them chasing each other around the yard, and my son would be up in his room watching too. I thought maybe he wanted to join in. He didn’t. He was just observing.

“Their movements have a pattern,” he told me.

“A pattern?”

“When the first one goes somewhere, the second follows in the same direction. The third runs twice as far. The fourth always lags behind. If you watch long enough, you can figure out the rules.”

Strange thing to say. I didn’t know what to do with it.

One evening the neighbor came over. He brought two beers.

“I envy you,” he said.

“They’re always pulling at each other. Every one of them affecting every other one. One falls down and three more go with him. I spend everything just keeping them together — I’ve got nothing left to really see any of them.”

I took a beer. Quiet for a while.

“For us,” I said, “everything goes toward the one. There’s nowhere else for it to go. I think that’s heavy for him. To be the only target.”

He nodded.

“Four things and the force gets spread thin. One thing and it all pours in.”

“Whether that’s good or bad — honestly, I don’t know.”

We drank without talking.

From the other side of the fence, faint voices drifted over. Someone crying, someone laughing, someone trying to calm things down. Upstairs, my son’s light was on. Between the curtains I could make out his shadow.

He was probably watching something again.

The way water changes shape. The way light shifts its angle. Why he’s the one alone in this house — maybe he was thinking about that, maybe not.

I found out much later that the reason those four kids were arranged the way they were had to do with the house itself. The floor plan divided things into four separate spaces, and the siblings had just settled into them, one per room. The structure placed them.

My son keeps the hood pulled up for a reason too. His room is the spot in this house where the sky opens widest. Underneath that hood, he’s always looking up.

Four and one. The difference in numbers wasn’t an accident.

But which one is happier — that’s probably only something they’d know themselves.