Speak, sing, or hum directly into a long cardboard tube — a paper towel roll works, a longer mailing tube works better — and listen to how the sound changes. Try whispering, shouting softly, and singing to compare. Two people can also talk to each other through a tube each, like a low-tech telephone.
What you need
- a cardboard tube (paper towel roll or longer)
How to do it
- 1Hand over the tube and say, "Talk into this and listen to what happens to your voice."
- 2Try a few different sounds — a hum, a whisper, a shout at normal volume — and notice how each changes differently.
- 3If there are two of you, each take a tube and try talking to each other through them from across the room.
- 4Tape two tubes together end to end and compare how a longer tube changes the sound again.
Variations
- If no tube is on hand: cupped hands around the mouth give a smaller version of the same effect.
- How it ends: a favourite sound repeated one last time — a giggle or a growl — is usually the natural stopping point.
💡 Parent tip
Save every cardboard tube for a week beforehand — variety in tube length and width makes the comparison more interesting.
What your child develops
- Auditory exploration — hearing how a resonant space changes sound builds early acoustic intuition
- Self-directed experimentation — comparing whisper, hum, and shout is a small science process
- Body awareness of voice — many children rarely notice their own voice as a physical, changeable thing
Safety notes
- Check the tube has no sharp edges or loose fibres before handing it over.
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