From July 4, 1845 to October 6, 1847—a period of two years, two months, and two days, for those counting—Henry David Thoreau bid adieu to the trappings of civilization to retreat into the forest, there to dwell in a 10 x 15 ft. cabin he had built with his own two hands out of mostly cheap scraps, such as repurposed shanty boards. We know the precise materials he used (and exactly what they cost him) because he proudly documented this constructio…