According to my research on minimalistic art design, I can say that based on the information provided within the question it is the idea that a painting or sculpture is primarily a physical object. Minimalistic design's usually focus on incorporating and working around square and rectangular shapes and designs within the art/sculptures.
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He painted by composing sketches of specially crafted landscapes he often did at night and drawing portraits.
In the studio, he portrays the characters he portrays in lavish interiors or in front of deep landscapes as in the famed paintings: The Boy in Blue, William Hallett with his Wife, Morning Walk, and Robert Andrews with his Wife).
