Early learning · 2026-07-17

When a Block Becomes a Phone

Holding a wooden block to their ear to say 'hello' isn't just cute. It is a major cognitive leap that lays the groundwork for abstract thought.

"Hello? Is Grandma there?" When you see a toddler holding a rectangular wooden block to their ear, having an earnest conversation with an invisible caller, it is hard not to smile. Often, there might be a realistic, battery-operated toy phone sitting right there in the toy box, yet they deliberately choose the plain wooden block instead.

This isn't just a heart-warming, cute moment. Through the lens of child development, using a block as a telephone represents a monumental cognitive leap in a young brain.

The Birth of Symbolic Thought

In the very early stages of life, a baby's world is literal and immediate. A block is simply a piece of wood to be mouthed, banged, or stacked. But around the age of two, something magical happens. The renowned psychologist Lev Vygotsky observed that in play, children reach a point where they begin to separate "meaning" from the physical "object" ¹.

When a child decides a block is a phone, they are practicing "object substitution." This is the dawn of symbolic thinking—the understanding that one thing can stand for something entirely different. While adults take this for granted, it is the exact same mental muscle required for all future abstract learning. When a child eventually learns to read, they must understand that a squiggle on a page stands for a sound. When they learn maths, they must grasp that the symbol "3" represents three real apples.

The block becoming a phone is the very first rehearsal for reading and mathematics.

The Power of Blank Spaces

Many modern toys are designed to be highly realistic, essentially doing the imagining for the child. A plastic phone that flashes and rings is very good at being a phone, but it is hard for it to be anything else. In contrast, an undefined object—a simple block, an empty cardboard box, a soft scarf—offers a "blank space" that requires the child's mind to activate it.

This seemingly simple pretend play is also a powerful workout for a child's executive function ². When a child decides a cardboard box is a boat, they have to hold the rule "this is a boat" in their working memory. They must suppress the impulse to treat it like a boring box, and they must plan their actions and vocabulary around this newly invented reality.

How Grown-ups Can Join the Game

When children immerse themselves in an imaginary world, they are not only building their brains; they are extending an invitation for us to join them. Entering this world doesn't require Oscar-winning acting skills. It simply requires acceptance.

If your child hands you a fallen leaf and tells you it's a train ticket, you don't need to correct them by saying, "That's just a leaf." You simply take it and ask, "Thank you, what time does our train leave?" Just as a learning companion like Sparkie might gently ask "What happens next?" to stretch a story, we can use simple, curious questions to keep their narrative flowing.

Pretend play is a safe laboratory where children make sense of a complex world. In this lab, a block can connect them to distant loved ones, a box can fly to the moon, and an adult's willingness to play along is the best fuel they could ask for.

Things to try at home this week

• Curate a "loose parts" box: Fill a clean shoebox with open-ended items—cardboard tubes, fabric scraps, a few pebbles, and wooden blocks. Leave it in their play area and watch what these items become.
• Accept the invisible gift: When your child hands you a cup of "invisible tea" or a slice of "mud cake," take a sip or a bite and describe the taste. "Wow, is this strawberry flavour?"
• Pause before correcting: If you see your child pushing a shoe across the floor like a car, resist the urge to tell them what shoes are really for. Observe how they breathe entirely new life into an everyday object.