minimalism
US /ˈmɪn.ə.məl.ɪ.zəm/
UK /ˈmɪn.ə.məl.ɪ.zəm/

1.
a style or technique (as in music, literature, or design) that is characterized by extreme sparseness and simplicity
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Her apartment was decorated in a sleek, modern minimalism.
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The artist is known for his use of minimalism in his sculptures.
2.
a deliberate lack of ornamentation or detail in design or art
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The architect embraced minimalism, creating clean lines and open spaces.
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The exhibition showcased the beauty of minimalism in contemporary art.