Darwin's 'Sand-walk' or 'thinking path'; was created in 1846 when a 0.6ha area of land was fenced off and planted out with native trees and a circular path dressed with sandy gravel around the edge. Darwin would take his daily constitutional and walk a number of times around the sand-walk counting the laps with flints piled at the beginning of the circuit. It was strolling around this path where he did most of his thinking.

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