Hamptonese

From a section of the Wikipedia page on James Hampton 
Hampton kept a 108-page loose-leaf notebook titled St James: The Book of the 7 Dispensation. Most of the text was written in an unknown script that remains undeciphered. The text is available online and has been the subject of research.
Hampton altered the seventh dispensation so that he became not only the author of The Book of the 7 Dispensation but also a prophetic counselor of the Millennium. Hampton recorded "the Old and the New Covenant" and a second set of commandments, which Hampton believed God had given to him to pass along because man no longer followed the original Ten Commandments.
Some of the text was accompanied by notes in English in Hampton's handwriting. In the notebook, Hampton referred to himself as St. James with the title "Director, Special Projects for the State of Eternity" and ended each page with the word "Revelation." Hampton had also written texts, some of which refer to religious visions, on various pieces of paper and cardboard and on a few pages in each of seven other notebooks. Tacked to a bulletin board in a corner of the garage was the message "Where there is no vision, the people perish."
Hampton also created wall plaques with Roman numerals one through ten and his undecipherable script suggesting commandment-bearing tablets. The largest plaque on the left side of the display contains the text "Nations Readjustment Plan" and is trimmed in gold foil.
Hampton approached local churches about using his creation as a teaching tool but none were interested. Two reporters came to view the display but did not deem it worthy of news coverage. Hampton hoped to develop a storefront ministry but never achieved that goal.
Hampton was somewhat reclusive. He had few close friends and spent most of his personal time working on his shrine. Hampton attended various churches in Washington but never joined a particular congregation because of his belief that the proliferation of denominations contradicted the oneness of God. He expressed an interest in finding a "holy woman" to assist with his life's work but never married.
It is unknown whether Hampton considered himself an artist. Hampton's work is an example of outsider or naïve art – art made by people who are self-taught, who have not studied art techniques, art history or art theory.
The Smithsonian Institute page is 
Category:Undeciphered writing systems