The 3D models below give a short introduction to the Junk Rig and its associated spars and control lines.  The glossary (scroll down) gives a more detailed account of the terms associated with sailing a junk rigged boat. The video at the bottom of the page shows what many consider to be the biggest advantage of the junk rig: the ease with which it can be reefed quickly and efficiently and, in most cases, without leaving the cockpit.

Please note that the creator of the 3D models, faced with the many different variations of the rig, chose a version that is intended to illustrate the way the rig is controlled, rather than show a definitive sail shape.