Projection screens have optical coatings that enhance their reflective properties; white walls don’t. You can certainly use a wall if you want to, and you may get a watchable image. However, compared to the image you get with a proper screen, highlights will not be as brilliant, contrast and color saturation will be reduced, and sharpness will be decreased as well. You may end up with an image that is not as good as your projector is capable of delivering.
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