Nonrepresentational art is another way to refer to abstract art, though there is a difference between the two. Fundamentally, nonrepresentational art is work that does not represent or depict a being, a place, or a thing in the natural world.

If representational art is a picture of something, nonrepresentational art is the complete opposite. The artist will use form, shape, color, and line— essential elements in visual art— to express emotion, feeling, or some other concept.

It's also called "complete abstraction" or nonfigurative art. Nonobjective art is often viewed as a subcategory of nonrepresentational art.
https://www.thoughtco.com/nonrepresentational-art-definition...

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not resembling or portraying any object in physical nature:
a nonrepresentational painting

http://www.dictionary.com/browse/nonrepresentational

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Note added at 26 mins (2018-01-12 12:26:43 GMT)
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A synonym that may fit the context
nonfigurative

1. (Linguistics) (of language) not figurative; literal
2. (Art Terms) (of art) not representing actual or natural objects or realities; abstract
https://www.thefreedictionary.com/nonfigurative

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Note added at 28 mins (2018-01-12 12:29:14 GMT)
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An example sentence:

the images cease to reflect reality, they become nonrepresentational/nonfigurative/abstract (or abstractions).