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Reconstructed drawing room of Sir William Burrell;

part of the Burrell Collection in Glasgo, Scotland

"A drawing room is a room in a house where visitors may be
entertained. The name is derived from the sixteenth-century terms withdrawing room and withdrawing chamber, which remained in use through the seventeenth century, and made their first

written appearance in 1642. In a large sixteenth- to early eighteenth-century English house, a withdrawing room was a room to which the owner of the house, his wife, or a distinguished guest who was occupying one of the main apartments in the house could "withdraw" for more privacy." 

From Wikipedia, the free encyclopedia

Rubin's vase(sometimes known as the Rubin face or the figure–ground vase) is a famous set of ambiguous or bi-stable (i.e., reversing) two-dimensional forms developed around 1915 by the Danish psychologist Edgar Rubin. They were first introduced at large in Rubin's two-volume work, the Danish-language Synsoplevede Figurer ("Visual Figures"), which was very well-received; Rubin included a number of examples, like a Maltese cross figure in black and white, but the one that became the most famous was his vase example.

One can then state as a fundamental principle: When two fields have a common border, and one is seen as figure and the other as ground, the immediate perceptual experience is characterized by a shaping effect which emerges from the common border of the fields and which operates only on one field or operates more strongly on one than on the other.

The visual effect generally presents the viewer with two shape interpretations, each of which is consistent with the retinal image, but only one of which can be maintained at a given moment. This is because the bounding contour will be seen as belonging to the figure shape, which appears interposed against a formless background. If the latter region is interpreted instead as the figure, then the same bounding contour will be seen as belonging to it.