All 3 Uses

preoccupied
in
Avant-garde and Kitsch
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(2) The excitement of their art seems to lie most of all in its pure preoccupation with the invention and arrangement of spaces, surfaces, shapes, colors, etc., to the exclusion of whatever is not necessarily implicated in these factors†
Of course, this cannot exclude other preoccupations in their work, for poetry must deal with words, and words must communicate.†
*
For him the medium became, privately, professionally, the content of his art, even as his medium is today the public content of the abstract painter's art — with that difference, however, that the medieval artist had to suppress his professional preoccupation in public — had always to suppress and subordinate the personal and professional in the finished, official work of art.†

Definitions:

(1) (preoccupied)
busy thinking about or doing something so that other things are not noticed or done
(2) (meaning too rare to warrant focus)
Much more rarely, preoccupied can mean that someone has already inhabited or taken something.