That morning the sky had spread a blanket of fresh snow over the world, soft and quiet. Everything was white: the rooftops, the hedge, the swing in the garden. Ziggy, Lily, Skye, and Dash had run outside with their scarves pulled up to their noses and their cheeks as red as ripe apples.

"Let's make a snow bunny!" shouted Dash, rolling a ball that grew bigger and bigger with every turn.

"And I'll make a kitten!" said Ziggy, who always thought about his four cats: Sofia, Dora, Poldo, and Milo.

Lily, with the tip of her tongue poking out in concentration, was shaping a bear with sturdy paws. Skye, though, calm as a slow cloud, was giving shape to a tiny little bird. She gave it two dark pebbles for eyes and looked at it for a long time.

"It looks a little lonely," she whispered. And she built another little bird beside it, so they could keep each other company.

That was exactly when they heard it coming. CHUFFFF CHUFFFF! From behind the snowy hedge came Toby the Magic Train, all colorful, with smoke that drew little hearts in the icy air.

"Chuff chuff, good morning children, what a joy to see you here!
Climb aboard my carriage, there's a brand-new place so near.
Someone far away has waited long for a gentle touch,
and one tiny, tender gesture can mean oh so very much."

The four friends clapped their hands and hopped onto the soft seats. The little train whistled happily and set off, gliding across white fields, over the hills, under branches heavy with snow that looked covered in whipped cream. The windows fogged up, and the children drew on them with their fingers: Ziggy a heart, Lily a star, Dash a funny face with its tongue sticking out. Skye, though, drew a little tree, without knowing why just yet.

"I wonder where Toby is taking us today," said Lily, her eyes shining with curiosity. "He said someone is waiting for us. But who?"

"Maybe a dragon!" suggested Dash, throwing up his arms. "Or a friendly giant!"

Skye looked out in silence, and it felt as if she could hear, deep in her heart, a kind of gentle call.

After a sweet journey, Toby slowed down and stopped with one last puff. In front of them was a little lake so calm it looked like a mirror: it reflected the sky, the clouds, and the white trees, everything twice.

"How wonderful!" whispered Lily. "You can see everything upside down in the water!"

"This is the Lake of Mirrors," said a little voice nearby.

But no one answered right away, because everyone was looking at just one thing. On the only shore without fresh snow stood a huge, bent tree. It was very, very old, with branches drooping tiredly toward the frozen ground. And as they watched, the tree let out a long sigh: "Uuuuff..."

Skye came closer, her heart pounding. "Why are you sighing, little tree?"

"I'm not a little tree anymore," the tree answered, in a voice that seemed made of wood. "I'm just old. And no one comes to visit me anymore. Once, all around here, butterflies used to fly: so many, so colorful, so light. Now I'm left bare."

The children looked at each other, not understanding. "Bare?" asked Dash, scratching his head under his hat. "What does bare mean?"

From a branch, an old bee came buzzing down, her wings a little worn but her eyes bright and lively. She smelled of honey and dried flowers, a sweet smell that felt like a memory.

"Bare means without leaves and without flowers," the bee explained calmly. "Like a tree left in its underwear, that's it!"

The children burst out laughing, and even the tree moved a branch just a little, as if amused too.

"I'm Bea," said the bee. "I'm the oldest one in the whole lake. I remember every single flower that ever bloomed here. And I remember when, all around this tree, there was a carpet of sweet-smelling flowers. The butterflies came from far away just for him."

"And why don't they come back now?" asked Ziggy.

"Because there's nothing to call them anymore," sighed Bea. "And my old friend, day after day, has almost forgotten that he is beautiful."

Lily rolled up her sleeves right away. "Then let's make a giant garden! With a thousand flowers!"

"I'll run and find the seeds!" Dash dashed off. But after two steps he slipped on the snow and landed on his bottom, plop, with a white snowflake right on the tip of his nose. "Ouch... and oops."

"And I'll invent a flower-shooting machine!" said Ziggy, hopping here and there gathering twigs and stones. He built a strange contraption out of two little sticks and a pinecone, aimed it at the sky, and blew with all his might. But all that came out was a little puff of snow that landed all over his face. "Pfff! It didn't work," he said, spitting out snowflakes.

They really tried, all together: they dug with their little hands, piled up snow, ran back and forth looking for something that looked like a flower. Lily even tugged on a dry branch, hoping it would turn green. But the ground was hard and frozen, and not even a blade of grass came up. The more they struggled, the sadder the tree seemed, and its branches drooped even lower.

"Maybe it's too late," the tree murmured, and its voice grew small. "Maybe I'm just a forgotten old trunk."

There was a moment of silence. The snow began to fall slowly again. The children stopped, out of breath, no longer knowing what to do. And in that silence, Skye did something no one expected.

She didn't run. She didn't build. She didn't shout. She went up to the tree, rested her cheek against the cold trunk, and stayed there, still, listening.

"What are you doing, Skye?" Lily asked softly.

"I can hear his heart," she answered without opening her eyes. "It beats slowly... he's still alive. He's just a little tired and very sad."

Then she spread her arms and hugged the great trunk, holding it with all the strength she had.

"You're not alone anymore," she whispered against the bark. "I'm here. We're here. And we won't go away."

And then something magical happened. Right where Skye rested her cheek, the snow began to melt, as if the trunk had warmed up with joy. One drop, then another, slid down from the branches and fell to the ground.

Bea flew over and landed on Skye's shoulder. "You see, little one? You understood what the others were looking for far away. It didn't take a whole garden. It only took someone to love him."

Skye knelt down and, with her bare little hands, gently brushed away the snow at the foot of the tree. Underneath, in the softening ground, she found something tiny: a single seed, round, dark, and forgotten.

"Look," she said softly, holding it in the palm of her hand. "A seed!"

"It's the seed of the last flower," whispered Bea, and her little voice trembled. "I thought it was lost forever."

Skye made a little hole with her finger, placed the seed inside, and covered it gently, the way you tuck in a blanket. Then she blew her warm breath over it, the kind you use to warm your hands when they're freezing.

At that very moment the snow stopped falling, and from the sky came a light rain. But it was no ordinary rain: its drops made music. Tin, tin, on the far-off leaves. Plink, plink, on the mirror water. Tock, tock, on the tree's branches. It was the rain that sings.

"Listen!" laughed Ziggy, his nose in the air. "The rain is singing a lullaby to the seed!"

Everyone held their breath. The ground drank in the sweet rain. And after a moment that felt ever so long, from the spot where Skye had planted the seed, a green sprout came up. Then a little leaf. Then a closed bud. And the bud slowly opened into a white and golden flower, that smelled exactly like honey.

"My flower!" cried Bea, flying in circles with happiness. "I searched for it all over the world... and it was here, asleep, just waiting for a hug!"

From the first flower a second was born, and then a third, and more and more, in a carpet of petals spreading around the trunk like a great, colorful hug. And then, from far away, came a soft flutter of wings.

A butterfly. Small, blue, silent. It flew straight to Skye and landed on the tip of her nose. Skye stayed perfectly still, with shining eyes and a huge smile filling her face.

"It came back," she whispered, so as not to frighten it.

And behind that first butterfly came two more, then ten, then a hundred: red, yellow, purple, orange, dancing around the tree like living confetti. The old trunk straightened its tired branches, moved them in the air, and it really seemed to be smiling with all its wood.

"I'm not bare anymore," said the tree, and its voice was now warm and strong. "And most of all, I'm not alone anymore. Thank you, little Skye. Thank you, all of you."

Dash, Lily, and Ziggy ran to hug Skye. "You taught us something," said Lily. "We were trying to do everything in a big way. You did one tiny thing. And it was exactly the right one."

"Sometimes," said Bea, landing softly on a flower, "the smallest thing of all, a seed, a hug, a kind word, is the one that changes the world."

The children stayed and played among the butterflies and the sweet-smelling flowers until the sky turned pink. Then, with a gentle whistle, Toby the Magic Train came back.

"Chuff chuff, we ride back home with hearts so full and bright,
a tired old tree is healed and everything feels light.
Remember, little children, that even the smallest deed
can warm a dear friend's heart the moment they're in need."

They climbed aboard, waving goodbye to the blooming tree, Bea the bee, and the cloud of butterflies. And as the little train glided toward home in the golden evening light, Skye rested her head against the window and fell gently asleep, still feeling the light tickle of a colorful wing on her nose.

That night she dreamed of a tree that was smiling. And, in her sleep, she smiled too.