“How many people think twice about a leaf? Yet the leaf is the chief product and phenomenon of life; this is a green world, with animals comparatively few and small, and all dependent upon the leaves. By leaves we live,” town planner Patrick Geddes told his students in 1919 in his final lecture at the University of Dundee in Scotland. “Some people have strange ideas … they think energy is generated by the circulation of coins. But the world is mainly a vast leaf-colony, growing on and forming a leafy soil … and we live not by the jingling of our coins, but by the fullness of our harvests.”
