All 3 Uses of

abstract

in

Fahrenheit 451

...the musical wall lit and all the colored patterns running up and down, but it's only color and all abstract.
p. 28.7

abstract = not imitating nature

And at the museums, have you ever been? All abstract. That's all there is now. My uncle says it was different once. A long time back sometimes pictures said things or even showed people.
p. 28.8 *

He examined his eternal matchbox, the lid of which said GUARANTEED: ONE MILLION LIGHTS IN THIS IGNITER, and began to strike the chemical match abstractedly, blow out, strike, blow out, strike, speak a few words, blow out.
p. 51.1 *

abstractedly = without thinking about it

Definitions:

(1) (abstract as in: abstract thought)
of a concept or idea not associated with any specific instance
(2) (abstract as in: read the abstract)
a summary; or to summarize -- especially academic writing
(3) (abstract as in: abstract art)
not representing or imitating external reality or the objects of nature
(4) (abstracted as in: abstracted, so didn't notice)
lost in thought; or distracted by thoughts
(5) (abstracted as in: abstracted his wallet)
removed
(6) (meaning too rare to warrant focus)