There is a line about hands that travels well. It reads cleanly, carries an air of philosophical dignity, and arrives in print wearing the name of Immanuel Kant. “The hand is the visible part of the brain,” runs the most common English form, or, in an older rendering, “the hand is the outer brain of man.” The phrase appears in publishing copy, in teaching materials, on Goodreads quotation pages, in popular psychology, in surgical textbooks, in neurology lectures, and in essays on sign language and gesture. It has the shape of something Kant should have said. The difficulty is that no reliable evidence supports treating it as a verified Kant statement.

Continue reading → Hands as the Language of Thought: Correcting a Kant Attribution