Why did Johannes vermeer use camera obscura in the allegory 1666-69?

Johannes Vermeer likely used the camera obscura as a tool in creating "Allegory of Faith" (1666-69) to achieve a heightened sense of realism and detail in his artwork. This optical device allowed him to project and trace scenes, enabling precise manipulation of light and shadow, which is characteristic of his style. The use of camera obscura may have also contributed to the painting's complex spatial relationships and the intricate interplay of colors, enhancing the overall visual impact and depth of the allegorical themes.