Copybook for over 100 years has been used to assess personality development from handwriting analysis. Handwriting analysis has be performed accurately for over 100 years without knowing the original copybook taught.
Suppose crime scene investigator's come upon document such as a ransom note or a suicide note that has been copied in an attempt to hide the offender's handwriting, the ink he used, or typewritten text. How can they determine that this copied piece of paper came from a particular copy machine?
When I took a course to prepare entering university test, one of my tutors made me very surprised. While I was writing a note, he stood behind me looking at my paper and started to guess my characteristics. Wonderfully, most of his analysis about me was almost perfectly correct. When I asked him how, he just said that my handwriting told everything about me.