Once one has begun to sense that Fibonacci thrill, one’s daily walks become more interesting. "Have you ever looked, thoroughly, relentlessly, at a tree: the fractal echo of veins and arteries in its branches; encrustations of lichen and moss; the smooth curves and dark fissures manufactured by tiny bark-cells, instinctively, miraculous? Then the leaves: their slim capillaries, the outrageous slide of colour from jade to emerald, gold, rust, dun; the manifold fruit-shapes: helicopters, petals, medieval flails. Have you recently nibbled a crab-apple? If not, why not?" Charlotte Mendelson reflects in the Financial Times.