How do you explain this? (Optics)

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The image of the street is projected onto the ceiling due to the window glass and curtain acting as a pinhole camera. This optical phenomenon occurs when light passes through a small opening, creating an inverted image on the opposite surface. To optimize the clarity of the projected image, adjusting the angle of the window and the size of the curtain opening is essential. The linked article offers a formula for selecting the appropriate pinhole size for better image quality. Understanding these principles can enhance the projection effect significantly.
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Hi. As you can see in the video attached, the image of the street is projected on the ceiling! Only a window glass and a simple curtain is involved. How does this happen? And how can I optimize (the window angle curtain etc) to get the most clear picture?
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Your curtains are probably acting as a pinhole camera. The linked article provides the formula for the selection of pinhole size.
 
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