A cyclorama or cyc is a large curtain, positioned at the back of the stage that can be lit to represent the sky or other backgrounds. Traditionally white or natural coloured cloth and hung at 0% fullness (flat). When possible, it is stretched on the sides and weighted on the bottom to create a flat and even surface. As seams tend to interrupt the smooth surface of the cyclorama, it is usually constructed from extra-wide material. Cycloramas often encircle or partially enclose the stage to form a background.