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