If we pay attention to more than one dozen of Vermeer´s paintings we can notice that the greater part of the artist’s oeuvre, are of course representations of domestic interiors and that just a few of these show distinctive and unique spaces.
The great majority of them seem to depict just a few rooms repeatedly, with sitters and furniture rearranged. It is possible to draw some tentative conclusions about how many rooms might be involved, by making an inventory of their architectural features: floor tiles, wooden ceilings, and characteristic patterns of leading in the window panes.
Paying attention to the patterns that Johannes Vermeer followed when drawing the windows of his paintings, we can notice how the main motives are based mainly on squares and on circles. To prove this, just look at the following photos in which a comparison between different paintings is developed:
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Not the same stained glass windows we see in his paintings, but they look very much alike. He definitely used the same motives in his windows, always bringing the light from the left.