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The Impressionists openly rejected any philosophical connotations, although their avant-garde approach to painting had important philosophical implications. By drastically diverging from the conventional perspectives of artists on visual reality, they created a logical new mode of artistic expression. Greek painters even made the connection between abstract ideas and concrete shapes, demonstrating their concrete comprehension of the cosmos. This materialistic perspective dominated painting far into the nineteenth century. By contrast, the Impressionists felt that the fundamental element of visual reality was light, not substance. This viewpoint is aptly expressed by the philosopher Taine, who said, "The chief 'person' in a picture is the light in which everything is bathed."
The Impressionists held that all solid objects were connected by light and that any divisions between them were artificial. Solid objects were merely surfaces reflecting light. This alteration altered how color and outline were handled. It was discovered that color resulted from light vibrations on a colorless surface, refuting the earlier belief that color was an intrinsic feature of objects. Originally intended to indicate the edges of an item, outline is currently only used to indicate the boundaries of often overlapping patterns. Impressionist paintings saw the world as a sequence of surfaces reacting to light, rather than as a collection of distinct objects. Filtered light frequently produces the mosaic of colors seen in an Impressionist painting.According to Mauclair, "light becomes the sole subject of the picture," with the objects it illuminates playing a supporting role. This shift means that painting is no longer only a visual art form. This ground-breaking new approach to art appreciation ignored all external ideas, whether they were moral, spiritual, or psychological, as well as any emotions that went beyond the purely aesthetic. The subjects of Impressionist paintings—people, places, and things—did not convey deeper meanings or tell tales. Instead, they merely served as elements of a light pattern that the painter used as inspiration from nature to create on canvas.