The Tree of Life: An Article on the World’s Most Powerful Metaphor
An Enduring Metaphor for All Life
In 1837, in a small, leather-bound notebook, the young naturalist Charles Darwin drew a simple, spindly sketch of a branching diagram. Above it, he scrawled two tentative words: “I think”. This humble drawing, a mere thought experiment, would grow to become the central organising metaphor for all of modern biology. It was a visualisation of a radical idea: that all life on Earth is related, diverging from common ancestors over immense spans of time, just like twigs and branches from the trunk of a great tree.
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