Focus on Officer and Laughing Girl and explain the Camera obscura.
Some art historians believe that Vermeer used a device called a camera obscura to help him create the perspective in his painting. Instead of using a mathematical formula or a vanishing point, Vermeer probably used this mechanical device to show him what the relative size of the people should be. A camera obscura is similar to a camera as it projects an image seen through the aperture into a dark chamber. There is no historical evidence that Vermeer used such a device but the way he portrays perspective in many of his paintings, including Officer and Laughing Girl, suggests that he did.
vanishing point camera obscura Camera obscura