Make a leaf print
You will reveal a leaf pattern by rubbing a crayon over paper. Pressing harder can hide fine lines, so the challenge is keeping the paper still and the rubbing gentle.
- Nature
- Starter
- About 10 minutes
Grown-up needed: yes for selecting the location, materials and supervising each observation
What you need
- A fallen leaf chosen by a grown-up
- Thin paper
- A crayon
- A flat table
The rule
Fallen leaves only.
How to do it
- Ask a grown-up to choose a clean suitable fallen leaf.
- Place it beneath the paper on a flat table.
- Hold the paper at an edge without shifting the leaf.
- Rub the side of the crayon lightly across the covered leaf.
- Compare the visible lines with the actual leaf.
- Wash your hands after putting the leaf aside.
Why it works
The leaf’s raised parts press against the paper more than its flatter regions do. A crayon catches those supported areas, making their pattern visible in the rubbing. Many of the lines are veins containing tissues that carry water and sugars through the leaf. Veins also contribute to its support. The rubbing shows surface shape rather than a complete view inside, so a dark line does not by itself tell you exactly what is flowing there.
Make it harder
- Use a lighter rubbing pressure.
- Compare two differently shaped fallen leaves.
- Predict the vein layout before revealing the second rubbing.
Ask Taz
- Why do raised parts make darker rubbing marks?
- Why do leaves need veins?
- Why can my rubbing miss some fine details?
For grown-ups
Use only a fallen leaf from a place the grown-up considers suitable, and wash hands afterwards. Compare the rubbing with the original so the child sees what the method reveals and misses. Ask at dinner: “What did the crayon make easier to notice, and what did it leave hidden?”
Taz is an AI and can be wrong, so stay close by. Read how safety works on Taz.
Show us yours
Film your hands and what you made, not your face or name. Ask a grown-up before posting anywhere else.
Questions parents ask
What if we do not see the expected result?
Record what actually happened, including missing sightings or changes in conditions. An observation does not need to match a hoped-for example. The listed time is an estimate and some activities need repeated visits.
Should we collect something to take home?
Follow the rule for this activity and leave living things undisturbed. A sketch and a few words are usually enough to keep the observation without removing anything from its place.
Must we show the record online?
No. Keep the record at home if you prefer. Any online sharing needs grown-up permission and the privacy line above.
More to try
See all Taz Challenges, or look through the science labs. One place for every why. Ask for early access at aitaz.com