Phoebe brought home a caterpillar from kindergarten this week. Not a real one, but a plush toy.
Phoebe and Her Caterpillar

“My name is Caterpillar. I used to live in London. One day I was having dinner and saw a purse, so I decided to hide inside and start an adventure. That adventure brought me to Finland, where I have met many wonderful little boys and girls. They take turns caring for me over the weekend and write in my diary with their parents about all the things we did together. Now it is your turn to take care of me and write in my diary!”
The Caterpillar's Notebook

The caterpillar travels with a diary of its own. Phoebe's class is actually called "Caterpillar" (next year it will turn into "Butterfly"), so this toy naturally serves as the class mascot. The rules are simple: each weekend, one child takes it home. It stays there for two days, goes back on Monday, and the family writes down what happened during the visit.

The diary is already full of moments from all the homes it has visited.
Phoebe's Weekend
This weekend, it was Phoebe's turn. She had been waiting for it for a while and had already been asking when the caterpillar would finally come to her. When school ended on Friday, she was visibly excited. But watching her hold it, you didn't get the sense she had just picked up a toy. It felt more like she had brought a guest home.

She starts taking care of it.
When we walked through the door, the first thing she did wasn't play with it. She prepared food for it. She called Molly over so they could feed it together, and the whole operation was surprisingly solemn. It wasn't the kind of scattered attention kids give something for two minutes before dropping it; it was a careful, deliberate kind of seriousness. You quickly realize she isn't pretending—she genuinely believes this thing needs to be looked after.

Sharing the caterpillar with her sister.
After dinner, she gave the caterpillar a bath and made a small bed for it. At night, she placed it directly next to her pillow. She slept completely undisturbed that night.

Sleeping with the caterpillar.
Saturday itself was entirely ordinary: games in the morning, ice cream and fruit in the afternoon, and a bike ride in the evening. Nothing inherently special, but the caterpillar stayed with her through all of it, just sitting nearby and quietly participating in the routine.

The caterpillar wants ice cream too.

Out for a bike ride.
On Sunday, she brought it along to see a princess and later tucked it under her arm for the supermarket run. That evening, she sat down and read it The Very Hungry Caterpillar. In Chinese. There is something fundamentally funny about one fictional caterpillar listening to the origin story of another fictional caterpillar.

Teaching the Finnish caterpillar Chinese.
At bedtime that night, the mood abruptly shifted. She went completely quiet. When I asked her what was wrong, she said, very softly, that she didn't want Caterpillar to go back. A few seconds later, her eyes went red and she just started to cry. It caught us off guard. To us, it had just been a small weekend activity. To her, it had clearly crossed a boundary into something real.
Her mom eventually stepped in and told her we could buy another caterpillar just like this one to keep at home permanently. Only then did she manage to calm down, though she still fell asleep clutching it tightly.

Time to say goodbye.
A Small Reflection
The premise is very minor: a toy, a notebook, and a weekend rotation. But watching her navigate it, you see something entirely concrete. She fed it, made it a bed, and when it was time to hand it back, she felt genuine grief.

Phoebe's drawing of the caterpillar.
Adults usually assume kids are just playing out a script, but occasionally you catch them taking a relationship entirely seriously—even if that relationship happens to be with a stuffed caterpillar.
Bonus: Caterpillar's Weekend Diary
Caterpillar's Diary at Phoebe's Home
Caterpillar's Sweet Weekend with Phoebe
This weekend I stayed with Phoebe. On Friday after school, we went to Pasila together. Phoebe took me to a children's playground and we played heavily. I liked it very much.
At home, Phoebe made dinner for me. Her little sister Molly helped too. They fed me and took good care of me.
In the evening, Phoebe gave me a bath and made a small bed for me. I slept next to her and had an excellent sleep.
On Saturday morning, we played games. In the afternoon, Phoebe gave me ice cream and fruit. I ate very well that day. In the evening, we went outside and rode bicycles.
On Sunday, Phoebe took me to see a princess. We also went to the supermarket. In the evening, Phoebe read me a book, The Very Hungry Caterpillar, in Chinese. I listened carefully.
I had a calm and happy weekend with Phoebe and her family. Thank you for taking care of me.
This post is just my perspective—your input will make it richer!