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<http://schema.org/description>
"A new virtual reality/stylus technology drawing system was recently demoed by a Brown University research team that might signal the next step in interactive apps. In an interview with Physorg.com, the system’s creators demonstrated the full apparatus, including a VR mask and a stylus and tracking device for each hand. The ‘Drawing-on-Air’ device allows professional \\\\[…\\\\]"
<https://www.wired.com/2007/11/brown-universit/>