non-representational       
adjective  art specialized (US also nonrepresentational) uk/ˌnɒn.rep.rɪ.zenˈteɪ.ʃən.əl/ us/ˌnɑːn.rep.rɪ.zenˈteɪ.ʃən.əl/
 (指艺术风格)非写实的,抽象的
(of a style of art) not showing things as they are usually seen
  His first non-representational work was Madrigal, in which he conveyed emotion through coloured rectangles, triangles and diamonds.  他的第一幅抽象画是《牧歌》,画作通过矩形、三角和菱形色块表达感情。 
 I am in no way opposed to non-representational and conceptual artworks. 我对抽象派和概念派艺术毫无恶感。 
 - More examples
 - He does wonderful non-representational form and figures and metal sculptures.
 - A stylized detail of a forest floor won in the non-representational painting class.
 - He paints in a deliberately uninflected way, in non-representational colours.