The projection surface must be any (wallpaper, paint, canvas, screen, etc.). The main thing is the color of the surface, it should be light (white or light colors). On dark colors (black, blue, burgundy), the projection is hard to see.
Lighting conditions.For projection, the room needs to be darkened - during the day you need to close the curtains, dim the lighting in the evening. In daylight, the projection is clearly visible only on a small area with a width of no more than 1-2 meters.
In a darkened room, the average projection size is 4 meters wide. In complete darkness, the projection size can be up to 8 meters wide with a single projector.