In operation, when viewing the exterior surface of the lamp, a viewer sees {HEAD ~ only a portion} of {TAIL ~ the complete image} when the light source is extinguished  
In operation , when viewing the exterior surface of the lamp , a viewer sees { HEAD ~ only a portion } of { TAIL ~ the complete image } when the light source is extinguished
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH