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From the late-nineteenth century onwards visual abstract or formal qualities were increasingly emphasized, analyzed and finally isolated by painters.
Visual abstraction is not merely an aesthetic quest; it is a biological necessity.
The dark blue gown of , whose inner creases and folds are barely indicated, is transmuted into a pure, bell-like shape which is understood only through its two graceful external contours.
Volumes are reduced to their simplest geometric components. For example, the block-like gown of the seated mistress of has been transformed into nothing less than a geometrical fortress, which may have entailed considerable manipulation given that such carpets were probably not stiff enough to produce such simple, structural folds by themselves.