Marshall McLuhan? Winston Churchill? Henry David Thoreau? Robert Flaherty? Emerson Brown? John Culkin? William J. Mitchell? Anonymous?

Question for Quote Investigator: The famous media theorist Marshall McLuhan has been credited with a brilliant adage about the co-evolution of humans and tools. Here are two versions:
- We shape our tools, and thereafter our tools shape us.
- We make our tools, and then our tools make us.
I have not been able to find a good citation. Would you please help?
Reply from Quote Investigator: A thematic precursor to this saying appeared in the famous 1854 book “Walden” by U.S. naturalist and essayist Henry David Thoreau. Boldface added to excerpts by QI:1
But lo! men have become the tools of their tools. The man who independently plucked the fruits when he was hungry is become a farmer; and he who stood under a tree for shelter, a housekeeper. We now no longer camp as for a night, but have settled down on earth and forgotten heaven.
Thoreau was writing about agriculture and construction, both of which had enormous influence on human culture. A separate Quote Investigator article about the quotation immediately above is available here.
In October 1943 U.K. Prime Minister Winston Churchill delivered a speech in the House of Commons. Churchill employed a phrase that partially matched the saying under examination:2
On the night of 10th May, 1941, with one of the last bombs of the last serious raid, our House of Commons was destroyed by the violence of the enemy, and we have now to consider whether we should build it up again, and how, and when. We shape our buildings and afterwards our buildings shape us. Having dwelt and served for more than 40 years in the late Chamber, and having derived fiery great pleasure and advantage therefrom, I, naturally, would like to see it restored in all essentials to its old form, convenience and dignity.
Churchill referred to “buildings” instead of “tools”, but buildings may be viewed as specialized tools for providing shelter. Interestingly, by 1965 a variant using “tools” was being attributed to Churchill. Details are provided further below in this set of chronological citations.
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