Un-be-leaf-able

Just playing with what's lying around....

Collection

Central cavities

A bouquet of lacunae

Temperature gradients

Negative spacing

Updraft

Rank and file

Emotional monologue

Riposte

They are being pressed in an old phone book, perhaps for a further purpose, perhaps simply to be discarded later?

What a wonderful thing is a leaf - a "thin, dorsiventrally flattened organ" ... the most important organ of most vascular plants.

In case you were wondering about seasonal leaf loss, here's a bit of science from Wikipedia:

Various accessory pigments (carotenoidsand xanthophylls) are revealed when the tree responds to cold and reduced sunlight by curtailing chlorophyll production. Red anthocyanin pigments are now thought to be produced in the leaf as it dies, possibly to mask the yellow hue left when the chlorophyll is lost—yellow leaves appear to attract herbivores such as aphids. Optical masking of chlorophyll by anthocyanins reduces risk of photo-oxidative damage to leaf cells as they senesce, which otherwise may lower the efficiency of nutrient retrieval from senescing autumn leaves.