The Object Permanence Box
The ball disappears into the hole, then reappears in the drawer: the great mystery of objects that come back.
The Object Permanence Box is a Montessori activity for a child aged 18 to 24 months. Area: Sensorial. Time: 5-10 min.
What the activity builds
Build object permanence: what disappears keeps existing. The ball swallowed by the box reappears in the drawer, and your child confirms this fundamental law of the world with their own hands, as many times as they need to.
The materials
- A wooden object permanence box: a hole on top, a drawer or tray where the ball reappears
- If you don't have one, a sturdy cardboard box with a hole in the lid and a flap on the side
- A wooden ball too big to fit in the mouth
How to do it, step by step
- Set the box in front of your child, the ball beside it.
- Pick up the ball, carry it slowly above the hole, and let go: it disappears.
- Wait a moment, without a word: the sound inside, then the ball reappearing in the drawer.
- Pick the ball back up and hand it to them: it's theirs now.
- Let them repeat it as many times as they want: repetition is exactly how the certainty gets built.
The parent's role
Show once, then step back. This activity looks simple enough to fill with words, a playful 'where's the ball?', suspense, resist that urge. The box asks the question and gives the answer, your silence lets the thinking happen. Intense interest in repeating it, sometimes twenty times in a row, is exactly the sign that something is being built.
Safety
A solid wooden ball, too big to swallow. No drawer that can pinch fingers: check how it slides before presenting it.
You remain the sole judge of what is right for your child. These activities are offered for educational and recreational purposes: they do not replace medical advice or the guidance of an early childhood professional.
Ways to adapt the activity
- Easier: roll the ball into the open box, just for the motion of it.
- Harder: the box with the drawer closed, which has to be opened to find the ball.
- Extension: hide an object under a cloth, then under two: the same mystery, somewhere else.
Up next
More activities for a 18 to 24 months child.
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A tray in both hands, a short trip, and a cup that must not spill: the signature movement of independence.
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Knobbed Cylinders
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Where's your nose, where's your elbow: the words for the body arrive through the pointing finger.
Drinking From an Open Cup
A real little glass, filled just at the bottom, and the pride of drinking like the big kids.
Rolling a Ball
A ball that leaves, rolls, and comes back: the first back-and-forth with another person, no words needed.
Animal Sounds
The cow says moo, the cat says meow: first words often start right here.
Shaking Instruments
A bell, maracas, a small tambourine: discovering that a motion makes a sound.
Zipper Practice
Pinching the zipper pull and tugging in one clean motion: a movement that opens coats and pencil cases.