II. THE MIDDLE AGES
                The Middle Ages inherited the ancient idea of art
 and made use of it
                    theoretically and practically. Art
 was considered as a habitus of the practical reason.
 Thomas Aquinas defined art as an
                    “ordering of reason”
 and Duns Scotus as
                    “the right idea of what is to be
 produced” (ars est recta ratio factibilium, Col. I, n. 19),
                    or as “the ability to produce based on real
                    principles”
 (ars est habitus cum vera
                        ratione factivus; Opus
 Oxoniense, I, d. 38, n. 5). Medieval
                    art was indeed
 governed by fixed canons and by rules of the guilds.
                    Hugh of Saint Victor said: “Art can be said to be a
                    
                     knowledge which consists in rules and regulations”
                        (
ars
 dici potest scientia, quae praeceptis
                        regulisque consistit;
 Didascalicon, II). This medieval idea
                    of art embraced
 handicrafts and sciences as well as fine arts. 
Liberal arts were now considered as the arts par
                    excellence,
 the arts proper; “art” without an
                    adjective meant:
 liberal art. The seven liberal arts were logic,
                    rhetoric,
 grammar, arithmetic, geometry, astronomy, and music
                    (including acoustics); they were—according to our
                    understanding—sciences, not arts.
                
However, the Middle Ages were interested in non-
                        liberal arts as well; they did not depreciate them any
 longer by
                    calling them “vulgar” but called them “me-
 chanical arts.” Since the
                    twelfth century Scholastics
 had tried to classify these arts and made a
                    point of
 distinguishing seven of them, in symmetry with the
 seven
                    traditional liberal arts, as did Radulphus Ardens
 in his
                    “Speculum Universale” (see Grabmann). So also
 did
                    Hugh of Saint Victor, who divided the mechanical
 arts into lanificium (supplying men with wearing ap-
 parel), armatura
                    (supplying men with shelter and tools),
                    agricultura, venatio (both supplying food),
                        navigatio,
 medicina, theatrica. This was
                    the major contribution
 of the Middle Ages to the classification of the
                    arts. Two
 of those seven arts were similar to modern
                    “fine” arts,
 namely armatura,
                    which embraced architecture, and
                    theatrica or the art of entertainment (a peculiar medi-
 eval concept).
                Music was considered a liberal art, being based on
 mathematics. Poetry was a
                    kind of philosophy or
 prophecy, or prayer or confession, and by no
                    means
 an art. Painting and sculpture were never listed as arts,
 either
                    liberal or mechanical. Still they certainly were
 arts, after all, as
                    abilities based on rules; why then were
 they never mentioned? It was
                    because they could have
 been classified only as mechanical arts,
                    appreciated
 only when useful; the utility of painting and sculpture
                    seemed insignificant. This shows the great change
 which has taken place
                    since; these arts which we con-
 sider as arts
                    in the strict sense, the scholastics did not
 think worthy of being
                    mentioned at all.