A curved screen reaches into the viewer's peripheral vision creating the illusion that they are being drawn into the picture. This perceived reality is further reinforced by a curved screen's ability to cover the center and the right and left channel speakers. This is important because it joins the image with the sound from the three forward points of sound origin (right, center, and left channels) creating a sound stage effect that results in a more realistic association between sound and the picture. Lastly, a properly curved frame design eliminates a visual artifact known as "pincushion effect". Pincushion effect happens when the distance to the right and left edges of the projected image are larger than the center resembling an hourglass laying on its side. This is caused by light expanding over the greater distance it travels. The further the distance, the larger the light "footprint". On a cinemascope projection screen, light must travel a greater distance to the right/left edges than it does at the center. The distance actually causes the image to expand disproportionately on the sides creating a sideways "hourglass" image where the center of the picture is smaller than the right and left ends are. Since the right/left edges of the screen are curved forward on a "curved" screen, it allows the light to travel the same distance to any other point on the screen as it does to the center. This results in a "uniform" image that is free from distortion. With all the benefits that a curved frame projection screen has to offer, more and more dedicated home theater aficionados favor them.