Literally, a place where four roads meet. A quadrivium is also defined as being a course that was offered at medieval universities in which students learned the four mathematical arts: arithmetic, geometry, astronomy, and music.
In virtually any photography course rudimentary forms of math are used to calculate exposure values with geometric sequences and fractions; composition & design strategies are routinely studied which are riven with simple principles of geometry; and the study of various forms of light reveal its spectral color properties, in addition to practicing observations of astronomic objects — the sun & moon are popular favorites. In regard to the music aspect, well that’s a form of poetry, so let’s equate that to the expression of all of these technical things that manifest in the visual poetry of photographs. To get to my point, a photography course easily meets and exceeds the definition of a quadrivium: interdisciplinary practices.