In 1975 Aldo Giorgini developed a software program in FORTRAN called FIELDS, a numerical visual laboratory devoted entirely to art production. Working extensively as both artist and scientist, Giorgini was one of the first computer artists to combine software writing with early printing technologies, leaving an aesthetic legacy in the field of the digital arts. His individual process was innovative in that it consisted of producing pen-plotted drawings embellished by the artist's hand with painting, drawing, and screen-printing. This paper is the product of a multi-year study of Giorgini's primary source materials provided by his estate. The authors examine the methods used by Giorgini during the 1970s that allowed him to create computer-aided art, in the hope that publishing this work will ensure that future generations of digital artists, technologists and scientists can be educated in Giorgini's contribution to the history of the digital arts.