Growing up · 2026-10-18

The Bear Doesn't Know the Box is Empty

When children realize that what you know is different from what they know, they unlock the magic of understanding other people's minds.

Over the weekend, a family took a little red cogwheel train up into the Swiss Alps for a hike. Four-year-old Mia secretly hid a pinecone she had just found by the path inside her snack box. She snapped the lid shut, held it out to her grandfather sitting opposite, and asked, "Grandpa, guess what's inside!"

Grandpa played along, stroking his chin. "Hmm, I'm going to guess... delicious apple slices!"

Mia erupted into joyous laughter. She popped the lid open, proudly revealing the pinecone. But if her two-year-old brother were sitting there and you asked him what Grandpa thought was in the box, he would likely just say, "A pinecone!"

Why does a two-year-old assume Grandpa knows there is a pinecone inside, while a four-year-old giggles endlessly at successfully "tricking" him? Hidden within this simple little game is one of the most profound milestones in early childhood cognitive development: the emergence of Theory of Mind.

From "My View" to "Your Mind"

Over a century ago, the pioneering Swiss psychologist Jean Piaget observed children playing in Geneva and noticed something fascinating: young children are naturally "egocentric" in their thinking ¹. In the world of a two- or three-year-old, it is taken for granted that what they see is exactly what you see; what they feel is what you feel; and any secret they know is known by the entire world.

This is why toddlers playing hide-and-seek often simply cover their eyes with their hands or bury their faces in a sofa cushion. Their logic is perfectly sound within their developmental stage: If I can't see you, then you definitely can't see me.

However, as children reach the age of three or four, their brains undergo an astonishing leap. They begin to realise that other people have their own distinct thoughts, beliefs, and knowledge. Psychologists call this "Theory of Mind" ². It is the growing ability to tune into other people's mental states and understand that someone else's perspective might be completely different from reality, and different from their own.

The Snack Box of Surprises

One of the most famous experiments in developmental psychology is known as the "False Belief Task". In this classic test, researchers show a child a box of sweets, but when they open it, it actually contains pencils. The researcher then asks the child, "When your best friend walks into the room, what will they think is in the box?"

Children under three will usually say "pencils." Because they know the truth, they assume their friend must know it too. But a four- or five-year-old will smile and say "sweets." They understand that their friend didn't see the box being opened and therefore holds a "false belief" about what is inside.

Mia's game with her grandpa on the train is a real-life version of this task. Similarly, when a child occasionally hides a drawing behind their back and asks, "Sparkie, do you know what I painted?", they are actively and excitedly testing whether this little round companion shares their secret knowledge.

The Quiet Sprouting of Empathy

Understanding "you don't know what I know" or "you like different things than I do" is not just about becoming better at guessing games or hide-and-seek. It is the very foundation upon which human empathy and complex social relationships are built.

Because of this cognitive breakthrough, four- and five-year-olds begin to learn how to comfort a crying friend by offering the friend's favourite toy, rather than their own. They begin to truly grasp sharing and cooperation, and they even learn to tell harmless little white lies to protect someone else's feelings. Realising that other people have different minds is the first step towards genuinely caring for them.

Three Little Things to Try This Week

To gently nurture this seed of empathy and cognitive growth, we can weave a few simple practices into our everyday lives:

• Press pause during storytime: When reading a picture book, pause at a key moment and ask your child, "What does the bear think is going to happen?" or "Does the rabbit know the fox is hiding behind the tree?" This helps them practice stepping out of their own shoes to consider a character's perspective.
• Play 'guess what's in my hand': Hide a small object in a closed fist and let your child guess. Then swap, letting them hide something from you. Talk through your thought process out loud: "Well, my eyes were closed, so I don't know... is it a wooden block?"
• Talk about different preferences: Casually point out differing tastes at the dinner table. "You love blueberries, but Daddy finds them a bit too sour; he prefers bananas." Concrete examples help children see that everyone experiences the world differently.

When we see our children giggling because we guessed wrong about the pinecone, we can gladly laugh along with them. Behind that joyful sound is the wonderful evidence of their growing minds.