Art is, in the language of signs,
what poetry, philosophy and fiction are in the languages of words
As such there are dialects, competencies, vocabularies,
personal vernacular, jargon

To say that one doesn’t understand art at all reveals that it is the idea of art that has been alienated,
not the ability to recognise and engage with art on any level

Certain modes of art will surely be unfamiliar,
and one may be inexperienced in discernment
in an analogous way to how one’s palate might
be undeveloped in a gastronomical sense,
limiting the tastes one has acquired

It would follow however
that the underlying ability to appreciate and to create art is as natural
and inalienable as listening and speech