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Ivan Sutherland and Bob Sproull created the Sword of Damocles, an HMD that was held by a mechanical arm mounted on a ceiling. The gadget was connected to a computer and displayed simple wireframe graphics to the user. The arm tracked the user’s head movements but was difficult to use. The contraption was also too heavy and bulky for comfortable use.<ref name=”1”></ref><ref name=”4”></ref><ref name=”6”></ref>
Ivan Sutherland and Bob Sproull created the Sword of Damocles, an HMD that was held by a mechanical arm mounted on a ceiling. The gadget was connected to a computer and displayed simple wireframe graphics to the user. The arm tracked the user’s head movements but was difficult to use. The contraption was also too heavy and bulky for comfortable use.<ref name=”1”></ref><ref name=”4”></ref><ref name=”6”></ref>
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+===LEEP===
+[[File:LEEP logo (encoding fixed).png|thumb|LEEP logo]]
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+'''LEEP Systems''' was a company that developed early VR optics and [[head-mounted display]]s. It was headed by [[Eric Howlett]]. LEEP Systems developed [[LEEP optics]]. LEEP Systems was the first company to offer a commercial head-mounted display.<ref name="g041">{{cite web | title=LeepVR | website=LeepVR | date=1983-09-27 | url=http://www.leepvr.com/about.php | access-date=2024-08-13}}</ref>
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+LEEP enabled VPL and NASA's VR.
===Using personal computers and electromagnetic tracking===
===Using personal computers and electromagnetic tracking===