Lavater is most well known for his work in the field of
physiognomy,
Physiognomische Fragmente zur Beförderung der Menschenkenntnis und Menschenliebe, published between 1775 and 1778. Lavater is attributed with catalysing a golden age for
silhouettes through this work in physiognomy. According to him, the character of a person could be elucidated through examining their “lines of countenance”. The most accurate of readings were facilitated by the tracing of a profile outline portrait. This contour line could be filled with black or cut from the white paper and placed over a black backing. More often, the silhouette was simply cut from black paper. In the chapter “On Shades”, Lavater wrote, “What can less the image of a living man be than a shade? Yet how full of speech! Little gold, but the purest." The fame of this book, which found admirers in France and England as well as Germany, rested largely upon the handsome style of publication and the accompanying illustrations. The two principal sources from which Lavater developed his physiognomical studies were the writings of the Italian polymath
Giambattista della Porta, and the observations made by
Sir Thomas Browne in his
Religio Medici (translated into German in 1748 and praised by Lavater). Lavater's studies have also been related to
Franz Xaver Messerschmidt's work as a sculptor. His work being mentioned by
Ernst Gombrich described as a physiognomical fallacy. ==Poet==