ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks, hˈɑːɹmən ænd kˈɛnəθ sˈiː. nˈoʊltən wɜːɹ ɛkspˈɛɹɪməntɪŋ wɪð fˌoʊɾoʊməsˈeɪɪk, kɹiːˈeɪɾɪŋ lˈɑːɹdʒ pɹˈɪnts fɹʌm kəlˈɛkʃənz ʌv smˈɔːl sˈɪmbəlz ɔːɹ ˈɪmɪdʒᵻz.
In 1966, Harmon and Kenneth C. Knowlton were experimenting with photomosaic, creating large prints from collections of small symbols or images.