There have been a number of excellent photos on leaves recently. It's very appropriate because of the fall season.
These photos reminded me of some school activities about 75 years ago.
I had an excellent teacher for grades 3,4 and 5. She was far ahead of her time when it came to excellent learning projects. One of them was on leaves.
The whole class of 17 from gr one to nine would spend an hour or two wondering around off the schoolyard collecting leaves for a project. So in this little field trip we observed many different plants. She didn't know the names but we observed plants.
I think my technique for this has weakened but I hope you can see the outline of a leaf.
When we got back to the classroom we chose leaves to make a tracing with our pencils. Of course, we had to arrange the leaves in an interesting manner. Then she displayed our works. We did not have a bulletin board and I don't think scotch tape had been invented yet. Thumb tacks were used to attach our work to the wall.
So my teacher evaluation hat says that she could teach many things with just one item. Every moment to her was a teachable moment.