We are touring around Thomas Jefferson’s home, Monticello, near Charlottesville, Virginia. One super interesting display had Thomas Jefferson’s personal pocket notebook. In 1780-1820 they certainly did not have digital devices to write on and paper and erasers were scarce and expensive. Jefferson had a pocket notebook made out of ten thin ivory pieces attached together into a book. The genius of it was he could write ideas and dates and drawings on it with a pencil and it would erase and could be used over and over.