Corrections could be made by typesetting a word or line of type and by waxing the back of the galleys, and corrections could be cut out with an X-Acto knife and pasted on top of any mistakes.
Facetti was instrumental in redesigning the Penguin line, introducing phototypesetting, the 'Marber grid', offset-litho printing and photography to their paperback covers.
However, the reason Donald Knuth gave for creating the TeX typesetting system was his dismay on receiving the proofs of a new edition of his book The Art of Computer Programming at the unreadability of the then new close-fitted phototypesetting technology, which he described as "awful" due to its "poor spacing".
René Alphonse Higonnet (April 5, 1902 – October 13, 1983) was a French-born engineer and inventor who co-developed the phototypesetting process with Louis Moyroud, which allows text and images to be printed on paper using a photoengraving process, a method that made the traditional publishing method of hot metal typesetting obsolete.