The present invention relates generally to {HEAD ~ devices} for interacting with {TAIL ~ computer systems}, and in particular, to a device which may be used to render otherwise passive surfaces audiovisually interactive via invisible surface codings 
for interacting with
The present invention relates generally to { HEAD ~ devices } for interacting with { TAIL ~ computer systems } , and in particular , to a device which may be used to render otherwise passive surfaces audiovisually interactive via invisible surface codings
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH