liberal arts (idea)

The "liberal arts" are classically enumerated as:

the Trivium, linguistic studies, consisting of
• Grammar
• Rhetoric
• Logic

the Quadrivium, mathematical studies, consisting of
• Arithmetic (number)
• Geometry (number in space)
• Music (number in time)
• Astronomy (number in time and space; "the music of the spheres"). Astronomy has been largely superseded by general Newtonian physics.