In recent years metal framing has become increasingly popular as a medium for scenic construction. The use of welded steel or aluminum tubing allows scenery to be constructed from material that is smaller in cross section, more securely joined, and in some cases lighter than traditional wood framing. This method has the added advantage of being very quick to assemble using easily constructed jigs. Furthermore, there is actually more salvageable material left from steel framing than from the wooden type. There are some quite large scenic units for which metal framing is the only logical alternative.