Alessio Bortot. (2021). OPTICAL RAYS SHINE AS RAYS OF LIGHT: THE CONCEPT OF PROJECTION BETWEEN OPTICS AND GNOMONICS. Revista Brasileira De Expressão Gráfica, 3(2). Recuperado de https://rbeg.net/index.php/rbeg/article/view/34 (Original work published 1º de dezembro de 2015)