This file and its description are from Wikimedia Commons.
Summary
DescriptionAverage human vs tree trunk circumferences.png
English: This image shows the silhouette of an average adult male with a waist circumference of 95 cm (0.95 m), compared to tree trunks of various circumferences. Ordered from the smallest to the biggest, the tree trunk circumferences are: 0.1 m, 0.5 m, 1 m, 3 m, 5 m, 10 m, 15 m, 20 m, 30 m, 40 m, and 50 m.
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Captions
Silhouette of an average adult male (waist circumference 95 cm) compared to tree trunks with circumferences ranging from 0.1 m to 50 m, illustrating the scale difference.