{HEAD ~ Relatively tall and short structures} are fabricated, wherein {TAIL ~ the short structures} comprise light sensing capabilities 
wherein
{ HEAD ~ Relatively tall and short structures } are fabricated , wherein { TAIL ~ the short structures } comprise light sensing capabilities
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH