Highwire is a form of tightwire walking but performed at much greater height. Although there is no official height when tightwire becomes highwire, generally a wire over 20 feet (6 m) high are regarded as a highwire act.Skywalk is a form of highwire which is performed at great heights and length. A skywalk is performed outdoors between tall buildings, gorges, across waterfalls or other natural and man-made structures.