Unusual lighting effects are employed in the permanent exhibit buildings at the Los Angeles County Fair. The picture, an interior view of the agricultural exhibit building, show the type of fixtures used, all being constructed with opaque white Cel-O-Glass. The center lighting trough, 760 feet long, bids for the distinction of being the longest lighting fixture in the world. Cel-O-Glass is made by the DuPont Company. It is a coated mesh which produces perfect diffusion of light and on which any pictorial copy can be reproduced.