a device configured to provide {HEAD ~ contents} including an image to a first user by making a signal of said contents into {TAIL ~ a state} capable of being sensed by said first user, 
a device configured to provide { HEAD ~ contents } including an image to a first user by making a signal of said contents into { TAIL ~ a state } capable of being sensed by said first user ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH